Outgrown puzzles or ones they didn't take to in the first place, optional: cardboard containers, markers or paints, glue for making 'sets.'
Wooden puzzle pieces, especially the chunky ones or ones with pegs, make great 'characters' for pretend play. If your child is through with fitting the pieces into the spaces, or just never took to puzzles, store the board and use the pieces. If you want to be really creative, you can create a shoe box barn or zoo for animal puzzle pieces, or a garage for car and truck puzzle pieces. New life for old toys!