Sometimes simple is not just enough. Specially when it's PC case. Here is my:
Step 1: Parts
Firs of all you need a PC case (Be sure to choose the right case for your PC components),
then you need wood and mediapan boards, glue for wood, Hot glue, Silicone, Glass or Plexiglas, Coolers, 12V Neon's for PC or car, oil paint or any glossy paint you find, LED's, wires, switches.
From the tools you need small saw, Hot glue gun, screws, air brush or brush, grinder, soldering iron, silicone pistol.