Jigsaw Planet has lots of pictures that become jigsaw puzzles when you click on them. You can also upload your own picture and turn it into a jigsaw puzzle. You can share them and embed them in websites. This can be used as a grouping activity, a way to introduce your lesson, and a way to review. Please ask me for ideas! http://www.jigsawplanet.com/
Thanks to Carmen Molnar for sharing!