I found this while searching on the web for a DIY art projector (see bottom link below for my version, which works great to project small, black outline tracings that are made on sandwich bags onto large canvases).
The Rasterbator is a fun way to just print some stuff out mural size. I like it because this way you can get an idea of what something actually looks like in a big wall size before thinking about doing it professionally. I'll bet that if you printed out each section on good inkjet paper and dry mounted each one onto foam board w/ spray adhesive, you could knock out a big piece in no time, and it should look pretty darned good. The interface is a little clunky, but hey, it's free, and it does all the math for you. Pretty neat.