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.
Leaning toward BM Hawthorne Yellow or Weston Flax for entryway, living room, and Kitchen (since it's all an open space). Beachnut Lane: Soft yellows from Benjamin Moore~ Hawthorne Yellow, Weston Flax, Concord Ivory!