Fin received a Woolpets needle felting kit for Christmas and last weekend while I was sewing, he got it out. I showed him the basics of needle felting (you jab at bits of wool fibre with a long sharp needle, making sure that you don't prick your finger, and preferably on some sort of padded surface. We used some foam left over from some packaging or other.)
This little fellow took him about an hour - and after the initial basic instruction was completed entirely without help. Fin was justifiably very pleased with his handiwork.