Short Beige Carpet, one window. Prefer it to be a darker color if possible.

I have mine painted in sage green. Very comforting.

Dark Color-Burgundy, forest green, brown.

The carpet being beige is considered neutral so you can paint the walls any color you like. I usually find a piece of art work I like or a framed poster and choose a couple colors from that.
Go to this site and upload a pic of your room and "paint" the walls. It will show 2 coordinating colors also.
https://www.sherwin-williams.com/visualizer/
It is free to register!