I thought something that might be kind of cool would be to make bike racks out of old bikes. You could weld a steel rod into the seat post cradle and mount it upside down in concrete. You would take the wheels off and maybe replace them with something like conduit bent into a circle and welded in place. The bikes could be painted differently almost as a work of art or something to make them more attractive.
Just a thought.

Andy
www.myvemma.com/unbent