That is too cute! I had my sister laughing at me for bursting in a fit of giggles while frantically sliding around the mouse.
My daughter got annoyed with my tormenting the poor rabbit and told me to just let him have it. 
I can’t even begin to understand how such stuff is done.
On a related note: Another neat site for artwork I ran into is
DeviantArt
Lots of good flash, icons, avatars, animations, etc. Check 'em out.