I remember having Lemmings and messing with the animation sprites from the game--I don't recall if they were saved in a bmp format or if it required a tool to extract. I'd try to recolor their hair or change their outfits pixel by pixel, but there were a lot of animations and a lot of frames. I always wanted to use them to build a Tetris/Lemmings hybrid game (the two games with the best music), but never got around to it.