Your kitties are amazing
I love your red room too, I planned one of my future rooms red too (everything is in the boxes now, waiting for me to find a nice place), but, actually, kitties see red as dark grey. Maybe they like dark grey, who knows.
Kitties see only the middle of the spectrum - from orange to violet, so the best color is blue, also they see well yellow and green. There was a thread about cat vision not so long ago on Cat General, very interesting. I myself found out a lot of things, I had no idea about.