Use Ikea Knuff magazine files as under sink storage holders. Screw a magazine file holder to the inside of kitchen cupboards. Add space to store more bulky items like chopping boards, cleaning products etc.
Crate Bookshelves: Find a wooden crate at craft store, paint any color you want, cut in half with table saw, attach hanging brackets with screws and attach to wall. Immediate eye catching book storage for little ones.