I recently edited a bunch of pngs to make a better portraits for my citizens(I hate seeing repetition). There are nearly 40(half male/half female) photos in there with the backgrounds cut out so they display with the ingame color coated citizen type background. FYI Prince Pecker is not in the pack. I just captured that civ before I took the picture.
http://www.filehosting.org/file/details/712044/PNGs.rar