This is something we've been cooking for a while, and we're exited to finally unleash this on the masses.
We've developed a system for making parametrized box designs for laser cutting. I've taken a few permutations of parameters and released them in the form of an auto-generated web-app at https://anibit.com/box
You can even download a dxf file template for use if you have access to a laser cutter and would like to make your own.
The whole thing is is alpha right now, there may be problems with the design, but what we've tested so far mostly works.
Please, we really want to hear feedback about this, we have big plans to expand it to cover more things.