There are a good number of instructables for painting the Xbox 360 and accessories, but none that focus on finer customization of the controller Guide button. If you're going for a truly custom look, the guide button is one component that is often overlooked. There is obviously a bit more going on in these project pictures, but I will just be focusing on the Guide Button here (with a small tangent for doing the same to another piece of the controller).
Step 1: Prepping the part(s)
The metal already has a bit of texture to it, but to ensure the best possible bond, it is a good idea to rough it up some more with sandpaper or otherwise score the surface a bit. I just used an X-acto knife and scratched it up good.
For this project, I was also putting custom lettering on the piece between the shoulder buttons which has a recessed Microsoft logo on it. That needed to be filled as well. The prep procedure is the same, but I used sandpaper to rough up that piece just a bit.
When the parts are ready, mix up a little bit of your favorite body putty and head to step 2.