On my walk yesterday, thankfully still permitted in our "stay at home" city, I admired violets in a median strip.  I'm quite sure they were voluntary, but the homeowner happily hadn't "weeded" them out.  There are lots of violets in lawns throughout our neighborhood, too.  Lovely.

It's much nicer to see violets than the emerald green weed and feed lawns in one of our nearby (upscale) neighborhoods, where I also walk. 

Although one of them had trillium, mayapple, bloodroot, and trout lilies in a front bed, nestled together with variegated hostas.  Remarkable.