finger = dedo :) Finger Knitting - Taught the campers to do this at summer camp this year. It was a huge hit and a perfect filler for the early finishers. Use a pencil to save their place so they can go back to it at a later time.
This pattern is for knit slippers, but I can totally see using a wool sweater and cutting and serging slippers from it! Home Slippers - DIY. this is knitting, but I bet I could use this to crochet some