Most of us have vast (and ever-expanding) collections of tools and never enough toolboxes to house them, let alone keep them organized. Building toolboxes for one's tools with one's tools is not only meta, it's a great project. See these videos for a few different toolbox ideas:

multifunction toolbox by Timothy Wilmots

My homemade toolbox, great project for your garage by Scott's Garage

Homemade aluminium tool box / tool chest by tittytwister5251

Homemade Toolbox by Bart Janssen

Pallet Toolbox by Make:

A Toolbox: Scrap Bin Challenge 2014 by John Zhu