I ended up chasing the walls in my place to hide the wires. Can be a dusty job, but I needed to take the wires from one side of the living room to the other for the rear surround speakers, and there's a door on one side and an arch to the kitchen on the other, so no continuous skirting to hide them behind.
You can hire electric wall chasers, I tried one in my place, but after just a couple of inches of the cut the place looked like the epicentre of a particularly bad sandstorm!!! Dust everywhere. So I just used an old tennon saw to cut two parallel lines in the board, put the wires in the channel and filled.
Leo