I use the Allsop Redmond Mouse Pad. I have been using it for a couple years now. It is metal body with a great sponge foam backing. Blends in nice with my iMac. Heavy in weight, so it does not move around. Have it on my solid oak desk and it has never left any kind of a mark. I believe that is due to the fact that it never moves around. Using it with a magic mouse.
I use it a lot and it still looks as new as when I bought it. Got tired of cheap mouse pads that curl or move. Below is a photo of what it looks like. Amazon has them on sale now for $20.