This would be cool to let a kid do with the crayon thing
Here's a rectangular frame similar to the spider web frame
bikes are such a cool thing to draw and do things with. you can draw a bike. better a retro bike. make it bright red or white on black.
Homens da Casa - HC - Decor com Atitude
You can also affix the PVC tubes to the wall as neat hanging racks (Love For The Laundry Area) - 53 Seriously Life-Changing Clothing Organization Tips - Some ideas are more useful than others