It isn't a web-centric project, but a ray tracer is a very simple (at its heart), yet almost infinitely upgradeable project. Given how computationally heavy it

It isn't a web-centric project, but a ray tracer is a very simple (at its heart), yet almost infinitely upgradeable project. Given how computationally heavy it is, that may knock out using that idea for PHP, Ruby, Python, Perl, etc...