I have just had my first theme accepted to the WordPress free themes.
Starting with themes for my own blog a year ago using Artisteer, I now have a theme at WordPress.
It started life as twenty ten, has a theme options page, and supports many of the latest WordPress functions.
The new theme Atmosphere 2010 is now available to the public, and any feedback welcomed!
I am already working on the next offering Rottweiler which will offer lots more control.