These delightful little flowers give us two or more months of solid bloom from late winter through mid-spring, and in addition to the flowers they have very decorative bronze-purple upper leaves. The only thing that keeps us from noticing them is that they are everywhere. If they were rarer, they would be loved; since they are in every lawn and sidewalk crack, they are ignored.
This plant was blooming in Beechview, where it was photographed on May 5.
For a full description, see the Lamium purpureum reference page.