You probably know I’m a big fun of plywood. When I saw this adjustable wall storage system from Kerf Design I really liked it. This system is build on a simple wall panel with holes, and you can easy add to it new elements. It can be a simple shelf, or a bookshelf even desk can be added into the wall. The company Kerf Design is located in Seattle and they do a lot of custom made project. You can have a look at their Facebook page for more inspiration.
The other projects (bellow) ) are from Baukind which have designed many kindergarten/day cares in Germany. You can see how easy it is accully to work with plywood and create simple storage elements and systems for children.