Best cable elevators for pc and speaker cables?

Toilet paper inner cardboard tube. Upgrade is paper towel inner carboard tube.
Cut, paint.
No problem.
If you have to spend money to impress your friends.. Plenty of ways to do so.

Use the tee pee method for speaker cables and Styrofoam from packing material for IC's and PC's. You can cut and shape the Styrofoam to your desired specs. Leave them white or paint to match your decor. Simple and effective.

I made my own from antique glass insulators from power and telephone poles. I built platforms from MDF and cylidrical lengths of oak for the upright supports. I wrapped a layer of Dynamat around the ends of each oak post so that the glass insulators would not vibrate when placed over the oak posts. I use rubber bands to secure the cables onto the insulators. They look cool and do their job. Searching for and collecting the various size, shapes, and colors was fun too. Of course the blue insulators sound best!

Two words.... Tinker Toys

I went on one of the auction sites and bought some old antique insulators from telephone poles. They are ceramic or glass and kind of cool. Took me a while to find a set of all the same as well as having a groove type top. I believe they call them Mickey Mouse Ear type. Sonic improvement? Nah... I did it to impress myself.
Good luck, JD