Here are some of the previous thank you cards I've made for Zane: 3 years old, 4 years old, 5 years old.
I always keep it very simple; a picture adhered to card stock. The more complicated I make it...the longer it takes to get in the mail. So simple it is! This year Zane is able to sit down and write his own messages. There was a bit of whining at first but after I gently reminded him of the kindness he received from the person who sent the gift, he quickly changed and began writing. I hope my boys always see the value in thank you cards.