We have purchased several of these mess free crayola books for our two year old son.
He loves to just color all over the place but it's a great method of learning and interacting.
Although he isn't old enough to comprehend the concept of it, he still has a blast. Plus it saves our wall, furniture, and every square inch of the house from being damaged.
We highly recommend this product to any child and we will continue to use crayola mess free products until he can color inside the lines :)