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.
Bedroom A monochromatic paint job lengthens the lines of the sloped ceilings, rather than chopping the room up. A host of patterns--stripes, tie-dye, patchwork--play well together in shades of yellow and blue.