making faces and decals is a simple task, just make it using any paint-like program: MS Paint, Paint.net, GIMP, Photoshop,etc.
size it to 256x256 and save it
then make it 64x64 and save that to another folder titled thumbs and throw the 256x256 pic in a zip folder aong with the thumbs folder and your done.
If you need clarification on my run-on sentences, just tell me.