AnimSprite v2.3.4 Lite
AnimSpriteLite is a nice program to display animate pictures at standy desktop and works with gif files.
Just look for a gif that you want and put it on C or E:/data/animsprite , depending on where you have installed AnimSprite 2.34. You can choose or change it everytime you want. You can also set a full gif wallpaper, but it will cover everything on screen like clock, battery, signal, etc.
Here is a shitload of gifs to get you started