This website catalogs hundreds of projects to do with your scraps of waste yarn, organized by length used.
I used the leftover yarn from my big foofy cowl to make this cute little stuffed whale.
As the pattern mentions, this little guy is meant to be a cat toy. I wasn't planning on letting Roosevelt play with it, but she managed to find it and rough it up all on her own. I guess it's pretty irresistible for kittehs, what with the floppy tail and being the same size of her ideal prey and all. I'll let her have it, I guess.
Awww...She loves it!