I dont know about
gifs dedicated to video game sprites, but there are numerous sites dedicated to still-sprites.
You can get spritesheets from pretty much every (sprite driven) game in existence (with some infuriating exceptions!)
the spriter's resource is one I use often; also, try googling a game and include "sprites" in the search- you will probaby get something (
maybe gifs...)
from a sprite sheet you could compile your own gif using programs like Gimp or just line the frames up in something like paint and use 'em that way (what I do)
Hope this helps
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Hey! I've got okayish internet now! Now I can try all those cool demos I've seen!