When it comes to kids there’s a lot of games for them but not much in the way of peripherals really. Genius recently sent over the Kids Designer graphic tablet for kids for me to review. I let my 5yr old son play with it and he likes it a lot. I then had to use it myself and I have to say for a kids tablet it’s not bad at all.
http://www.testfreaks.com/blog/review/review-of-genius-kids-designer-5-x-8-graphic-tablet-for-kids/