Watch a child's eyes light up as she unpacks an ornament she has made herself and hangs it on the tree. There are few gladder moments all year. Now imagine a tree covered entirely in your child's handiwork. We've festooned five trees with seat-of-the-pants ingenuity, using yarn, cotton balls, tinfoil, and other things you can find around the house. Kids can copy these ideas or use them as inspiration for their own designs. You'll end up with an exuberant collection you'll all be proud to showcase year after year.