[DownhillGoat]

^For the rears and fronts you can take the baseboards off, score/indent the drywall, run the speaker wire along the score, and then put the baseboards back on. The other thing I've seen (if you have access to your basement ceiling) is drill through the floor and run the speaker in the basement, then back up through the floor at the speaker locations. For the rears you can use speaker stands and run the wire up through them after that.

It's not ideal, but it works for the fronts and rears if you keep them close to the wall.