Step 1: Supplies
Xbox 360 controller (duh)
T8H Screwdriver (or a T8 screwdriver and a watch flat head screwdriver. There is another instructible about this)
Spray Paint in the Main colors (try to get the kind I used, but there should be others that work on plastic as well)
Model Paint for details (I used Citadel Paint but anything should work)
Glasses cleaner (not needed if the controller is new or fairly new)
A general Idea of what you want done
Patience (I picked up my controller too soon after adding the second color and it came off on my finger so I now have a black spot on the back)
Step 2: Brainstorm
Step 3: Open and Remove
Step 4: Paint
Use the glasses cleaners to get all the gunk off your controller.
Once your controller is nice and clean, Spray on the first color. Once that is dry, add tape wherever you want that color to be visible. Then spray your next color. Repeat as necessary.
Step 5: Detail, detail, detail
I added blood, green dots, and the words FATAL BLOW to my controller as well as triggers and bumpers each getting their own color.
Have fun p3wning the n00bs with your new amazing controller!!!