diff --git a/core/includes/common.inc b/core/includes/common.inc
index ee134ac..1e5f5eb 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -7,6 +7,18 @@ use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Database\Database;
 use Drupal\Core\Template\Attribute;
 
+use Assetic\AssetManager;
+use Assetic\AssetWriter;
+use Assetic\Asset\AssetCollection;
+use Assetic\Asset\FileAsset;
+use Assetic\Asset\GlobAsset;
+use Assetic\Factory\AssetFactory;
+use Assetic\Factory\LazyAssetManager;
+use Assetic\Factory\Loader\FunctionCallsFormulaLoader;
+use Assetic\Factory\Resource\DirectoryResource;
+use Assetic\FilterManager;
+use Drupal\Core\Asset\Filter\CssRewriteFilter;
+use Assetic\Filter\Yui\CssCompressorFilter;
 /**
  * @file
  * Common functions that many Drupal modules will need to reference.
@@ -2721,6 +2733,66 @@ function drupal_get_css($css = NULL, $skip_alter = FALSE) {
     $styles['#attached']['js'][] = array('type' => 'setting', 'data' => $setting);
   }
 
+
+
+  // Experiments with Assetic start here.
+  $am = new AssetManager();
+  $fm = new FilterManager();
+  // $fm->set('yui', new CssCompressorFilter('/tmp/yuicompressor-2.4.7.jar'));
+  $fm->set('rewrite', new CssRewriteFilter());
+
+  $factory = new AssetFactory('sites/default/files/css');
+  $factory->setFilterManager($fm);
+
+  // We're going to rebuild the #items array.
+  $items = array();
+
+  // @todo Bring in debug value from... where, exactly?
+  // Sensible to use a debug flag as Symfony does
+  // (and it's sensible, anyway).
+  $debug = FALSE;
+  // $debug = TRUE;
+
+  if (!$debug) {
+    $groups = drupal_group_css($styles['#items']);
+
+    foreach ($groups as $key => $group) {
+      $grouped_asset = $group;
+      unset($grouped_asset['items']);
+
+      $paths = array();
+      foreach ($group['items'] as $path) {
+        $paths[] = DRUPAL_ROOT . '/' . $path['data'];
+      }
+
+      $asset = $factory->createAsset(
+        // These are the paths to the CSS files.
+        $paths,
+        array(
+          // These are the filters.
+          'rewrite',
+          // 'yui',
+        ),
+        array(
+          // This is the pattern we want to use for the group filename.
+          'output' => 'group-*.css',
+        )
+      );
+
+      // Add our new grouped asset to the AssetManager.
+      $am->set('group_' . $key, $asset);
+      // Add the URL of the new asset to the Drupal style array we created.
+      $grouped_asset['data'] = 'sites/default/files/css/' . $asset->getTargetPath();
+
+      if (!file_exists($grouped_asset['data'])) {
+        $writer = new AssetWriter('sites/default/files/css');
+        $writer->writeAsset($asset);
+      }
+      $items[$key] = $grouped_asset;
+    }
+    $styles['#items'] = $items;
+  }
+
   return drupal_render($styles);
 }
 
diff --git a/core/lib/Drupal/Core/Asset/Filter/CssRewriteFilter.php b/core/lib/Drupal/Core/Asset/Filter/CssRewriteFilter.php
new file mode 100644
index 0000000..5954ef2
--- /dev/null
+++ b/core/lib/Drupal/Core/Asset/Filter/CssRewriteFilter.php
@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Core\Asset\Filter\CssRewriteFilter.
+ */
+
+namespace Drupal\Core\Asset\Filter;
+
+use Assetic\Asset\AssetInterface;
+use Assetic\Filter\BaseCssFilter;
+
+/**
+ * Fixes relative CSS urls.
+ *
+ * @author Kris Wallsmith <kris.wallsmith@gmail.com>
+ */
+class CssRewriteFilter extends BaseCssFilter
+{
+    public function filterLoad(AssetInterface $asset)
+    {
+    }
+
+    public function filterDump(AssetInterface $asset)
+    {
+        $sourceBase = $asset->getSourceRoot();
+
+        $data = '';
+        $content = $asset->getContent();
+
+        // Simplify to a relative URL if the stylesheet URL starts with the
+        // base URL of the website.
+        if (substr($sourceBase, 0, strlen(DRUPAL_ROOT)) == DRUPAL_ROOT) {
+          $sourceBase = substr($sourceBase, strlen(DRUPAL_ROOT));
+        }
+
+        _drupal_build_css_path(NULL, $sourceBase . '/');
+        // Anchor all paths in the CSS with its base URL, ignoring external and absolute paths.
+        $data .= preg_replace_callback('/url\(\s*[\'"]?(?![a-z]+:|\/+)([^\'")]+)[\'"]?\s*\)/i', '_drupal_build_css_path', $content);
+
+        // Per the W3C specification at http://www.w3.org/TR/REC-CSS2/cascade.html#at-import,
+        // @import rules must proceed any other style, so we move those to the top.
+        $regexp = '/@import[^;]+;/i';
+        preg_match_all($regexp, $data, $matches);
+        $data = preg_replace($regexp, '', $data);
+        $data = implode('', $matches[0]) . $data;
+
+        $asset->setContent($data);
+    }
+}