Eventually this can be used as a memory game. In the meantime Owen likes to match-up the pictures on the bottle caps while they are all facing up.
Last week we turned the top of an egg carton into a glider. Launching it off of the loft was a fun activity on a very rainy day.
The next day we turned the bottom portion into a catipillar. (We only had Crayola poster paint. As you can see it chipped off the styrofoam pretty quickly.) While reading The Very Hungry Caterpillar Owen feed the pages of the book to his new friend.