Ethan got this aquadoodle activity set for his birthday and it is great! It consists of a four panel page that has pictures that are only revealed with water. What is so great about it is that fine motor skills are not really needed. As the page dries the set can be used over and over. It is now in our "going out to eat dinner" kit.
In addition to Thomas, there are also Dora and Sesame Street versions of this kit.