One of the first things we did when we were trying out the 3M DI-NOC carbon fiber vinyl was cover the lightswitch back plate. We had just painted the office a dark grey, so we though it would match perfectly…and it did 
Here’s a little run through of what we did:
We used a 12″x12″ 3M DI-NOC CA-421 carbon fiber sheet (although we could have obviously used a much smaller piece), but you can see it in comparison to the switch plate:
First we covered the front of the plate, and trimmed the edges a bit:
Next we pulled the edges and affixed it to the back. We used a heat gun to help stretch the material. This helped to make sure the edges…and especially the corners were taught:
Then we took an exact-o knife and cut out the holes for the light switches. We then pulled the pieces and stuck them on the back:
We didn’t have black screws yet, so we just simply took a sharpie marker for now and colored the screws black:
Here it is installed, it looks great!
Here’s a shot from a little further back:
