Hey, Roses, thanks for that input and source info. In lots of cases, foot traffic isn't an issue, so it's good to have a wide array of choices.
I know lots of people like ajuga (was it JB who talked about considering that?) and also vinca. I don't like vinca although I think it's attractive. I find it very difficult to work with; if you decide you don't want it where it wants to be, it's hard to root it out. Plus it takes a long time for it to actually cover ground. Matting plants like thyme, you know where they are and where they aren't, which is an advantage I appreciate.
Editing: Would you name some of what you use? That's a great link, by the way. Wish I hadn't just ordered a bunch of seeds already this morning!