First, take a solid color, and apply this overlay to it, and you've got yourself a cool new icon base:
Maybe you don't like that color, or maybe you want to add something on top of it:
Whatever the case may be, here it is for you to play with and go crazy. The overlay and the examples (and the original GIMP XCF!) are available at the Matt's XOOPS Mods Savannah Project. I hope this is useful to someone.