I have a client that wants no grass and only ground cover. I recommended wooly thyme for its partial sun, drainage needs, low to no maintenance, foot traffic tolerance, and aroma. It is very expensive, though, and I was looking for some alternatives to offer the client.
Certified GKH Gardening Expert
Take a look at corsican mint and sweet woodruff. They also fit those requirements. If you have not seen it, this site may be helpful: http://www.stepables.com/