300 lines of perl code, and now you can change these thumbnail icons in your image editing page. by default, our old standby will be given to new images when they are added. but then you can change it with any image you want. they still will be shrunk down to the same size square, so ideally pick a 105x105 pixel image (or at least a square image) to send.
right now, everything gets turned into a jpeg, so dont send animated gifs and expect them to work. (sadly. hope i can add this some day.)