Ajuga aka Carpet Bugle?

I like "Bronze Beauty," but there's also "Black Scallop" with larger darker leaves or "Chocolate Chip" with smaller leaves. Blooms in May here and provides nice winter color/structure too.

A perennial cranesbill (like my favorite Rozanne) will grow taller than requested but does very well in the moist somewhat shady feet of roses, too.

Here is a link that might be useful: Ajuga Bronze Beauty