Cable elevators

audiofool1, unless someone's playing basketball on your wooden floors, I don't see any problem. That, and anything you prop them up on will simply transmit the vibrations up to the cables, opening another can of worms. 

All the best,
Nonoise

If you have synthetic rug flooring, then you should keep them off the floor. If you have natural wool, cotton or wood flooring, I wouldn't worry about it. Aside from that, you can make your own or buy something similar to what you see in the ads for a considerable savings. Use your imagination.

In my case, I have my speaker cable looped around a nail in the wall behind the speaker from which hangs a wool carpet (for sound absorption). Looks fine to me. 

All the best,
Nonoise