by Doctor » Sat Apr 07, 2012 6:55 am
These "moving pics" are also known as .gif when referring to images (and file formats, for the most part), Google your way to finding how to make your own signature, that is the best advice I can give you.
You will need some sort of image editing software if you are going to make it yourself from scratch, I've never used GIMP but I would recommend it as so many people seem to like it, for a free alternative that is. Good luck.