Your snake doesn't care at all what color it is. It could be rainbows and ponies and I don't think they would even notice.
I like to insulate my tanks with something a little more low-profile. I usually use a couple layers of foam core board and it works fairly well. The pink insulation is usually pretty thick, and in my opinion...kinda ugly. I use white foam core and white chip board and it looks nice and does the job.