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.
I like the high shelf above the bed. Still gives you a place to keeps things while still allowing you to sit up in bed to read and such. Plus I imagine that having to actually sit up to turn off an alarm would help you wake up in the morning.