How to Make and Hang Wood Fruit Crate Shelves

The new floor plan and stuff switcheroo for the guest room/craft room leaves me with two vintage wooden fruit crates that won't fit in the room with the new plan.

Yay!

I want a new place to stash this stuff and allow my linen closet to hold linens again. Crazy town, I know.

I have a big boring wall above the toilet in the guest bathroom...

I have two crates and three 2013 DIY Goals: create storage, use what I have first before buying materials, and add personality to the guest bathroom...