Rock textures make for a pretty cool letter head! See for yourself, these photographic geological designs by POD-store KreaturRock on zazzle.com offers a wide range of variety. You'll find the solid granite as well as stone wall motives. Note that the texture is just about shining through the white main area.
All of these designs come with a template for easily customizing your return address. You can also adjust text font, size and color to your liking. This far only 2 of the designs have matching envelopes (must be ordered separately).
These are a few examples, please visit the store for the full series!
Please click image or text links for product description and a closer view.