Step One
If you're an unnamed user in Germany, you do the only thing you can, and that's set about turning that trash can into a PC case and fitting all those unused parts into it (spotted by 9to5Mac). The result is a hackintosh (a home-built PC running OS X) with a Core i3 (Haswell) processor, a Radeon 7750 graphics card, both an SDD and a hard drive, all powered by an ATX PSU.
It's nowhere near as powerful as Apple's Mac Pro, and it's larger—the LUNAR is 28cm x 19cm, while the Mac Pro is 25.1cm x 16.8cm—but it's otherwise the spitting image, and I think that's frakking awesome.
There are lots of pictures in the forum post where it was shared, but here are some highlights:
A Partially-Assembled Handcrafted-Bottom/Air Intake
The Innards
Taking Shape
Painting the Case
The Final Result