I have created boxes like this, wood boxes IKEA pained with lovely robins egg blue (c)Ferm Living Shop — Display Box - Aqua
What Art can do for a home - via Coco Lapine Design
My 10 Favorite Ikea Kallax Shelf Ideas More
Instructions on making fabric cover for ikea drona bin for expedit
The shelves are two Trofast systems from IKEA: http://www.ikea.com/us/en/catalog/categories/departments/childrens_ikea/
DIY ikea project bookshelves - I'm not sure how this is done because there are no instructions on the site but I could paint or cover boxes with fabric or contact paper and re create this same look.
Clipping Boxes together with big Binder Clips - viola!
Box shelves.... Hmmm.... never would have thought of it, but in this pic, I kinda like it.... Food for thought
Box Shelves from Ikea, Connected with Ordinary Office Binder Clips / 25 Awesome DIY Ideas For Bookshelves (via BuzzFeed)
Floating bookshelves More More