These juniper varieties are great for low growing ground covers and hillsides.
Juniper procumbens nana is know as the dwarf japanese garden juniper. They make great ground covers. They are often used as bonsai and the older plants make incredibly beautiful specimens.
Here is a close up of juniper procumbens nana
Juniper Bar Harbor is a blue green color that gets bronze tips in cold weather. It is a real ground hugger.