This is a great idea for anyone who loves to skate, young or otherwise.
If you have a few old boards kicking around, or even buy a few on Cragislist or the like, this is a decently simple DIY requiring only a few supplies:
2 threaded rods
16 bolts
16 washers
2 L shelf brackets
drill or right angle driver
2 skateboards
Interested? Get the full tutorial over at Instructables.