For the wall at the end of your kitchen . . . those picture ledges from Ikea for cookbooks, spices and small colorful things. Just make sure they aren't so long they get in the wall of getting the broom out from that space next to the frig.
Having a huge collection of children's books mean you don't have to listen to the same tale every single night — but adds major clutter to your kid's room. Use IKEA's picture ledges to create floating shelves for as many hardbacks as you need.