I love the San Francisco paper from SC's Here + There line. I wanted to use it as the background for my layout, but it is very colorful and busy. So I used white cardstock to mat the main part of my layout, and stamped a pattern with gray ink on the white cardstock. The effect is subtle yet pleasing. Tags, stamps, labels, badges are from Evalicious.
You can see a video tutorial of my process on my blog.