They turned out so cute - I used paints I had on hand already, and bought a Lego baseplate at Target for about 7 bucks. All in all, I think I spent about $3 each on these storage boxes, plus the cost of the Lego vehicle (small kits) that I bought to go inside.
The baseplate cut easily - I just scored it with a utility knife and bent it to break. I used hot glue to adhere to the top of the box and VOILA! instant portable Lego storage!
I really hope the boys enjoy these on Christmas and after!