You've probably seen the Lack side tables at IKEA . and then there's the Parsons cube side table from West Elm. Well you can easily put two Lack side tables together for the look of a Parsons table at a much lower cost and with more color choices!
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.