I realized that this site, and most sites, are completely void of carpet autotiles when I looked for some replacements for my game. I decided to do two recolorings with gimp. They can be found here.
http://img828.imageshack.us/gal.php?g=blackcarpet.png (http://img828.imageshack.us/gal.php?g=blackcarpet.png)
Not bad, all though on the black carpet, there's some odd squares on it. Is that intentional?