I did this with an Angry Birds toy that Daniel likes and it worked a treat.
I did this on our computer desk and it worked perfectly.
I tried this out and it works! I forgot to show the boys though, I must remember to do that.
I thought this was an excellent idea and tried it out. However, for some reason my writing did not fully erase off our freezer door - oops!! I don't know if the surface wasn't right or what. (Yes, I did use a dry-erase marker!) I still like the idea but might try sticking a whiteboard to the freezer instead of writing on the actual door.
I made these for my car-mad Noah and he loved them.