I bought a roll of 4 conductor flat speaker tape from www.smarthome.com. It was perfect for running rear channel speaker wires without having to tear into walls and fishing wire around cross joists. I split the four conductor into two pairs, sanded down some of the wall texture, stuck the tape to the walls, sprayed some texture knockdown and didn't even have to repaint since the knockdown matched the white wall! Pricey, but great stuff to have around.