I did my 2011 WRX right after I got it. Went with blue to contrast with the red, I like it.
One thing to add. Before popping back in the console light (the one you wire the footwell kit into), I pulled off the little rubber "diffuser" from the console light. The light's still red, only now I can actually see it. I didn't even know there was a light in there until I was looking at the instructions for the footwell kit.