What little boy does not love hot wheel/match box cars?! (And I had a little girl who once loved them too.)

These little cars are great for the imagination. They inspire dreams of the futuristic cars. Oh, the possibilities! And if you are lucky, as a mom, they CAN provide hours of entertainment.

However, within the land imagination there is always the realm of the no-no vicinity. WALLS! Alas, no matter how many times you tell the kids, it is inevitable that they are going to drive those little cars on the walls. What is a mother to do?