Here's a quick simple thank you note idea for kids...
The boys received lots of thoughtful gifts from family for Christmas and I think it's important to have them write notes of thanks. However, one per day is all we can manage on top of our school work.
(So it's taking us a while to complete them.)
Using the boys fingerprints, I made these cards. Not fancy at all, but cute. (I just colored their fingers with washable marker and made the print. It easily washed off at bath time. I attached the white paper to a folded piece of cardstock, and put the thank you notes from the boys inside.)
Luke did the majority of the writing and Ethan added a word or two and his name.
Aaron's contribution was just his fingerprint -- which was fine with me. 6 down, 2 to go!