I don't know if you like to do things yourself or you want someone to make one for you. Here's a very easy program, all you do is select 4 pictures and it make a gif file or animation file out of them.
http://photoscape.en.softonic.com/ If you want someone to make one for you, or if you just have any questions go to the "Test" forum and someone will help you.
http://www.yorkietalk.com/forums/forumdisplay.php?f=12
Donating members have a bigger size, but non-donating members can still have moving avatars.