To take a break from changing the physics engine in Boxycraft and keep myself sane, I put together this little program demonstrating Boxycraft 2's ability to use Lua scripts to create a functional GUI.
You can create controls, edit their properties and handle their events all from the Lua script. Try it out for yourself! When this is complete the possibilities for creating custom GUI's will be near endless, while still being extremely simple to use.
Click here to download it and view it's dicussion page in the forums.