I upcycled fruits crates to create a storage unit. I first painted the crates, then, I make a frame using a plywood panel. The process was quite simple, and I only used nails, glue and brackets to make the plywood frame. We put it in my son bedroom as a toy storage, but it will work perfectly as a bookshelf.
You can see the full tutorial on my blog.
Website: Ohoh Blog !