I bought some excellent wire from Accessories4Less. It's flat, navajo white wire, no adhesive. They also sell adhesive tape to go under it that doesn't screw up the paint on the wall. Just make sure they send you the right cable; they also have adhesive backed "cable" that's pretty much two flat pieces of copper in between two pieces of tape. Looks horrid, and tears off your paint. They sent me this one by accident, and it took me a couple of days to figure that out. When I called them, they sent me the right stuff free, and said I didn't have to ship back the wrong stuff.
Anyway, my surround wires are almost invisible; I could have done a slightly better job and made them even more invisible.
They're routed up the coreners and along the ceiling corner out to the QS4s.
