I just finished laying a limestone flag patio in the backyard.

This was done in sand; I excavated 8" down, put down a 6 mil plastic
barrier, three inches of crushed gravel and another three inches of sand
as a base for the flagstones. More sand was swept on top as filler.
It's quite attractive if I do say so myself! G

I'm looking for some sort of creeping ground cover that will establish
itself between the flagstones. In no particular order I'd like
something fragrant (either foliage or flowers), reasonably drouth and
winter hardy, will not object to a high sand and therefore rapid
draining substrate, low maintenance, ability to endure light foot
traffic, and ability to tolerate a couple of hours of full sun in the
later afternoon but dappled sun / shade during the rest of the day.

I'd appreciate any ideas, suggestions and sources.

Thanks,
--
Mike Harris
Austin, TX