diff --git a/includes/redhen_donation.forms.inc b/includes/redhen_donation.forms.inc
index af3b6a7..98f8d37 100644
--- a/includes/redhen_donation.forms.inc
+++ b/includes/redhen_donation.forms.inc
@@ -270,6 +270,69 @@ function redhen_donation_entity_settings_form($form, &$form_state, $settings, $e
     ),
   );
 
+  $form['settings']['suggestion'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('Personalize Donation Suggestions'),
+    '#description' => t('Suggest a donation amount based on prior donations.'),
+    '#collapsible' => FALSE,
+    '#tree' => TRUE,
+    '#states' => array(
+      'invisible' => array(
+        ':input[name="settings[donation_entry]"]' => array('value' => 'custom'),
+      ),
+    ),
+  );
+  $form['settings']['suggestion']['donation_suggestion'] = array(
+    '#type' => 'select',
+    '#title' => t('Donation suggestion basis'),
+    '#default_value' => isset($settings['settings']['suggestion']['donation_suggestion']) ? $settings['settings']['suggestion']['donation_suggestion'] : '',
+    '#options' => array(
+      '' => t('-- Disabled --'),
+      'largest' => "Largest Donation Amount",
+    ),
+  );
+  $form['settings']['suggestion']['suggestion_minimum'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Suggestion Minimum'),
+    '#default_value' => isset($settings['settings']['suggestion']['suggestion_minimum']) ? $settings['settings']['suggestion']['suggestion_minimum'] : 0,
+    '#description' => t('The smallest prior donation amount on which to base donations (useful to avoid extremely small donation suggestions if you have very small-value donors.)'),
+    '#size' => 10,
+    '#element_validate' => array('element_validate_number'),
+    '#states' => array(
+      'invisible' => array(
+        ':input[name="settings[suggestion][donation_suggestion]"]' => array('value' => ''),
+      ),
+    ),
+  );
+  $form['settings']['suggestion']['suggestion_increment'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Suggestion multiplier'),
+    '#default_value' => isset($settings['settings']['suggestion']['suggestion_increment']) ? $settings['settings']['suggestion']['suggestion_increment'] : '1.3',
+    '#element_validate' => array('element_validate_number'),
+    '#description' => t('When suggesting donation amounts, what should each amount be generated by to generate the next suggestion?'),
+    '#size' => 10,
+    '#states' => array(
+      'invisible' => array(
+        ':input[name="settings[suggestion][donation_suggestion]"]' => array('value' => ''),
+      ),
+    ),
+  );
+  $form['settings']['suggestion']['suggestion_sort'] = array(
+    '#type' => 'select',
+    '#title' => t('Suggestion sort order'),
+    '#default_value' => isset($settings['settings']['suggestion']['suggestion_sort']) ? $settings['settings']['suggestion']['suggestion_sort'] : '',
+    '#options' => array(
+      '' => t('- None -'),
+      'asc' => t('Sort ascending'),
+      'desc' => t('Sort descending'),
+    ),
+    '#states' => array(
+      'invisible' => array(
+        ':input[name="settings[suggestion][donation_suggestion]"]' => array('value' => ''),
+      ),
+    ),
+  );
+
   $form['settings']['submit_label'] = array(
     '#type' => 'textfield',
     '#title' => t('Submit button'),
@@ -613,7 +676,8 @@ function redhen_donation_form($form, &$form_state, RedhenDonation $donation, $us
   else {
     $default_product = reset($products);
   }
-  if (commerce_recurring_product_is_recurring($default_product) && !empty($settings['settings']['recurring_donation_amounts'])) {
+  $recurring_default = commerce_recurring_product_is_recurring($default_product);
+  if ($recurring_default && !empty($settings['settings']['recurring_donation_amounts'])) {
     $amount_options = $settings['settings']['recurring_donation_amounts'];
   }
   else {
@@ -628,6 +692,16 @@ function redhen_donation_form($form, &$form_state, RedhenDonation $donation, $us
   $donation_amounts_default = !empty($settings['settings']['donation_amounts_default']) ? $settings['settings']['donation_amounts_default'] : NULL;
   $amount_label = isset($settings['settings']['donation_amounts_label']) ? $settings['settings']['donation_amounts_label'] : 'Donation Amount (@cur)';
   $amount_title = format_string($amount_label, array('@cur' => $cur));
+  if (!empty($settings['settings']['suggestion']['donation_suggestion']) && $contact_wrapper->getIdentifier() && !$recurring_default) {
+    $suggestion_config = array(
+      'style' => $settings['settings']['suggestion']['donation_suggestion'],
+      'currency' => $cur,
+      'minimum' => $settings['settings']['suggestion']['suggestion_minimum'],
+      'increment' => $settings['settings']['suggestion']['suggestion_increment'],
+      'sort' => $settings['settings']['suggestion']['suggestion_sort'],
+    );
+    _redhen_donation_suggest_donation($donation_amounts, $suggestion_config, $contact_wrapper);
+  }
   switch ($settings['settings']['donation_entry']) {
     case 'select':
     case 'radios':
@@ -650,9 +724,12 @@ function redhen_donation_form($form, &$form_state, RedhenDonation $donation, $us
         '#default_value' => $donation_amounts_default,
         '#other' => isset($settings['settings']['other_label']) ? $settings['settings']['other_label'] : t('Other'),
         '#other_description' => t('Please enter an amount.'),
+        '#other_size' => 5,
         '#other_unknown_defaults' => 'other',
         '#other_delimiter' => ', ',
         '#select_type' => $settings['settings']['donation_entry'] == 'select_other' ? 'select' : 'radios',
+        '#field_widget' => 'select_or_other_buttons',
+        '#maxlength' => 30,
       );
 
       break;
@@ -756,6 +833,73 @@ function redhen_donation_amount_options_callback($form, $form_state) {
   return $form['donation'];
 }
 
+/**
+ * Helper function to generate custom donation amount options for a Contact.
+ * NOTE: intended for one-off donations, not recurring ones.
+ *
+ * @array $donation_amounts
+ *   Reference to the Options array for use in a select or radio field.
+ * @array $config
+ *   Relevant configuration information.
+ * @entityMetadataWrapper $contact_wrapper
+ *   Redhen Contact Wrapper: the Contact to suggest amounts for.
+ */
+function _redhen_donation_suggest_donation(&$donation_amounts, $config, $contact_wrapper) {
+  drupal_alter('redhen_donation_suggestion_config', $config, $contact_wrapper);
+
+  $lower_bound = !empty($config['minimum']) ? $config['minimum'] : min(array_keys($donation_amounts));
+  $contact_id = $contact_wrapper->getIdentifier();
+
+  $historical_donation_amounts = array();
+  
+  if ($contact_id) {
+    // Find historical one-off donations.
+    $query = new EntityFieldQuery();
+    $query->entityCondition('entity_type', 'redhen_donation')
+      ->propertyCondition('contact_id', $contact_id, '=')
+      ->propertyCondition('transaction_entity_type', 'commerce_order', '=')
+      ->propertyCondition('received', 100 * $lower_bound, '>=')
+      ->propertyOrderBy('received', 'DESC');
+    $result = $query->execute();
+    
+    if (!empty($result['redhen_donation'])) {
+      foreach($result['redhen_donation'] as $donation_result) {
+        $donation = redhen_donation_load($donation_result->donation_id);
+        $historical_donation_amounts[] = $donation->received / 100;
+      }
+    }
+  }
+  
+  drupal_alter('redhen_donation_historical_donation_amounts', $historical_donation_amounts, $config, $contact_wrapper);
+  
+  if ($historical_donation_amounts) {
+    switch ($config['style']) {
+      case "largest":
+        // Find a donation, build new amounts array:
+        $largest_donation = max($historical_donation_amounts);
+        if ($largest_donation && $largest_donation >= $lower_bound) {
+          // Round past maximum to nearest $5 for new suggestion.
+          $amount = 5 * round($largest_donation / 5);
+          $new_amounts = array();
+          while (count($donation_amounts) > count($new_amounts)) {
+            $new_amounts[$amount] = $config['currency'] . $amount;
+            // Increase amount for next loop, round to nearest $10:
+            $amount = 10 * round($amount * $config['increment'] / 10);
+          }
+          $donation_amounts = $new_amounts;
+        }
+        break;
+    }
+
+    if (!empty($config['sort'])) {
+      ksort($donation_amounts);
+      if ($config['sort'] === 'desc') {
+        $donation_amounts = array_reverse($donation_amounts, TRUE);
+      }
+    }
+  }
+}
+
 /**
  * Set defaults based on URL query parameters.
  *