Always get annoyed when it's time to set a shape for an npc and I have to go through the process of laying out the tiletypes in an array and then testing -> modifying it until the shape actually matches. So I made a tool. I have made a tool before but it wasn't that much easier, so now there's a nice graphical interface/drawing tool!
By default you open the tool with shift+t. Left click a swatch/tile type to select, and left click the canvas to draw out the tile types. Right click the canvas to erase or use the 'clear' button. Currently supports images and ganis, but gani support is pretty bare bones. I need to add some support for typical gani usage like parameters/attributes.
After you're done that all you have to do is hit generate and it will spit you out your code.
No external images are needed as far as I know. 'bed.png' is a default image and should be downloaded on any server. I see you still can't post gscript here, so find the code here:
http://pastebin.com/Ejwe5kYY