I made this little guy for the first class that I taught at my new job. Needle felting is a fun craft that's really addicting because it's so easy. Basically, all you do is poke wool roving (loose wool) with a special needle that has barbs on the the end. The barbs tangle the fibers and weave the strands together. This is the same way that felt is made, only on a single plane. With needle felting, you are doing it three dimensionally, so you use the needle to sculpt and shape the wool.
This mouse is very simple, but I thought he still turned out pretty cute. People can get really into needle felting and make really ridiculously detailed things. I'm not quite there yet.