Place painted foam board in the back of the bookcase, giving the look of a painted bookshelf w/out the commitment. Love this idea for a small book shelf next to couch. Good way to use yellow without committing to it in a big space.
beige walls, white windows and baseboards, I like the idea of a deep teal accent wall in the living room with yellow and coral accents. Couch either tan or dark brown. Accent wall in kitchen a lighter teal. Use red and coral accents in the kitchen.