This is a sandbox project, which contains experimental code for developer use only.
Pick your own icons and customize a block to "add nodes".
You will have the choice of using a jQuery enabled slide-down block of add buttons, or a static block of add buttons.
The button icons are set in the User Interface configuration section of Drupal Admin. I have included one icon and two smaller images that are used in the jQuery UI.
Icons should be 48x48. If you experiment with other sizes, you may have to alter the custom_add_block.css to adjust the gaps.
The icon block conforms to the space given.