I agree with Dytecture about using (and matching) the red for the accent wall. And I would strongly discourage using yellow--mostly because bright yellow and bright red in the same visual field remind too many people (including me) of the ubiquitous McDonald's colors.

Perhaps a large round table might mean a rug is not at all necessary. It could be a metal tray table, or carved wood like Rebecca Mitchell Interiors illustrates. Ideas also to consider, using multiple tables can be found at http://www.houzz.com/multiple-coffee-tables. I also agree with comments above that some color is needed on the walls. You could then hang round mirrors, or an unusual curved shape like RMI shows above.

Gallery walls are popular. You can do a nice geometric stencil in a metallic. But I'd prefer wallpaper. You can match your paint color to the background so it looks like a stencil, but it's faster and you'll have fewer imperfections. Many patterns come in temporary papers made for renters if you are worried about the removal process.

i want the wall with masks to have a drywall texture in neutral to light earthern tones. I prefer berger paints