The visual absence of cables in these photos makes me really envious. Today I regret not having buried a few large section Heliflex plastic pipes in my listening room to hide most cables under the floor. Although I did it for the HT cables of the back channels , I did not consider them for the main speakers. (Picture taken from http://www.theaudiobeat.com/visits/ead_wamm_mc.htm )
We did this, and it makes a huge difference. One piece of piano gloss furniture with smoked glass, 2 speakers and a Sub...all cables under the floor. If you ever decided to do it, let me know and can share a few thoughts on how we designed it...and we would design it again to make it even better next time.