Loads of Fun Painting an old VW Beetle

What a fun surprise M and G had yeserday at the McKenna Children's Museum in New Braunfels when they discovered that they were going to be able to paint an old Volkswagen Beetle with as much and as many colors of paint as they wanted!

It got me thinking...wouldn't it be fun to have a corner of one's backyard dedicated on an on-going basis for the painting of some large, unusual object?  Maybe an old statue found at a junkyard, a wooden yard sign, or even just an oversized rock.

What do you think would be fun to paint?