Posted: 17/02/2015 at 17:44
Geranium macrorrhizum would be near the top of my list. That's evergreen but thins out a bit in winter so you could have snowdrops as well.
Vinca is a trouble for me as it covers large areas then gets rust and looks awful.
Lamiums are another good one
Trachstemon orientalis is good, not evergreen but good large leaves swamp everything in the weed growing season
I find ajuga has a thin time in summer on my soil