Okay, as promised, I have put up some very fine demonstrations of Ruby/DLX:

* ruby-sdl: A binding of libSDL/libSDL_image to Ruby + simple demo
* ruby-ogl: A binding of libGL/libGLU to Ruby + NeHe's tutorials 02 and 07 to act as a demonstration
* ruby-ode: A binding of libode/libdrawstuff (Open Dynamics Engine) to Ruby, with the TestBuggy as a demonstration.

Again, all of the above examples are using only Ruby (Ruby/DLX), no specific library-to-ruby-extension-C-code-complexity was required.