So Brad over at maptool (the guy who does al the tutorials) has created a marketing video for maptool and he's throwing the floor open for any map that people would like to donate for use. I've put together a dungeon from the tiles that he's used and others have passed other maps. If you use maptool for your games, this would be a great way to help the project, and Brad has said that he intends to make a few versions of the video, so your map should get face time on a video for a tool that already serves over 8000 people monthly (from very rough estimates).

The thread from the rptools forums is here:
http://forums.rptools.net/viewtopic.php?f=8&t=8867