After the Beanie Baby craze when Ben was in first grade, the next big thing (at least that I can remember) was Pokemon. He still has his cards, etc. and I'm amazed how the cartoon has lasted! I made this Pokeball hat for my niece and it was a fun, quick project to knit. I may do one for Ben just for the heck of it. The felt Pikachu I'd made for Ben was well-loved and I thought he would like to pose with the hat. Pikachu was very happy to oblige.
The pattern is available as a Ravelry download.