Yes there are a number of very hardy plants that may suit the job...
Creeping myrtle (Vinca) will quickly fill in open spaces with short trailing vines and adorable purple flowers.
http://en.wikipedia.org/wiki/Vinca Hens and Chicks (Sempervivum) may be another choice.
http://en.wikipedia.org/wiki/Hens_and_chicks And Ajuga
http://www.thegardenhelper.com/ajuga.html I have noticed there is a section in Home Depot or one of those stores that have a greenhouse attached where they have something they market as "steppables" or something like that. Everything in that section can be a possibility.
Good luck and happy gardening
-Frank | 
