Dude, what a great idea. I love stuff like this b/c it's using what you have in a new and better way... much like Parkour in general!
Another thing along these lines is to put bars or baby gates in some doorways of your home. That way you can practice vaults while just walking from room to room. I have a pet rabbit, and use baby gates to keep her out of certain rooms, so I practice jumps that way.