See if this helps Here is a link that might be useful: here

Pick out colors or whites like you want. Paint on poster board, or buy the peel and stick color patches and put on poster board. Leave a white border all the way around the poster board, so it doesnt clash with the color you have now. Since you want the whole house the same color, then pick a color that goes in your kitchen with your cabinets etc first. Then try it in the rest of the house. The color in there now, does not go with your cabinets. It has way too much yellow in it. I would look for colors that have no yellow hues.

https://www.houzz.com/products/query/drum-side-table/nqrwns Here are lots of drum side tables. The rug should be big enough to slip under the front 1/3 - 1/2 of the sectional and extend past the right and left ends of it by a foot or more. Use blue painter's tape on the floor to tape that out, then measure and buy a rug in the closest size to what your taped rug measures.

Yes a runner would be safer on the stairs. That raised edge (if I am seeing right) is a terrible tripping situation. My good friend had that and it was really bad. Hope you can get that done.