advice on hiding cables

When I had my speakers in the living room with equipment across the room about 18 feet from the speakers, I thought about going through the basement floor and up but realized this would take a lot of extra cable and a lot of extra work. I got some Goertz MI-2 cables and ran them under a rug in front of the speakers and then under the speakers (they were raised up on spikes). The rug ended a few inches from speakers, so all that was visible was a few inches of nice copper flat cable. My wife was very happy and it was a very practical solution.

Pull off the baseboards, use a router to make a nice groove in the back and run the cables in the groove--this way there is no sheet rock repair. If you do it carefully, you shouldn't even need touch up paint.

I know a gentleman(?) who drilled a hole in his floor and ran his cables under the floor. He has a basement so the whole thing was pretty easy. Is that a possibility?

How about duct tape ? A million roadies can't be wrong. It comes in loads of colors these days, so you'll probably find a pretty close match.
( I think you should pass this suggestion along to your wife and try to keep a straight face while doing so).

Actually I think Ultraviolet's idea is a really good one .. tucked away in my mind for possible future use.

@miner42 I understand your problem and think you might find something acceptable as a compromise to in-wall routing on Amazon. I was looking for something similar myself and ran across an add-on channel that runs along the baseboard. The advantage to doing it this way is that if you desire to make changes to the room arrangement down the road, it will be much easier and of course less expensive.