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Clover 
For centuries, it's been used as a domesticated ground cover plant. Clover nourishes other plants around it, by making trace minerals accessible and by fixing nitrogen from the air (it's a type of legume).
Just a few decades ago, it was considered an essential part of lawns. Clover seeds were always included with grass in seed mixes.
Then agricultural chemical companies convinced everyone it was a weed that needed to be killed, so they could sell both herbicides and lawn fertiliser.
Ugh 
yes yes, lawns bad. Some of y’all are so predictable.
But
The modern version of lawns are monoculture wastelands, maintained by poisons, fertilisers, and fossil fuel powered blade machines. Those are undeniably terrible.
Lawns which actually support biodiversity of both plants and insects wouldn’t be nearly as bad. If people would get over their obsession with short trimmed homogenous grass, I wouldn’t hate them nearly as much.
tl;dr Don’t micromanage a lawn. Cultivate a tiny grassland.
@InvaderXan also if you MUST have flat greenery to walk on, \o/ MOSS LAWN \o/
@Nine Moss is very underrated!
@InvaderXan moss is friggin amazing and more people should appreciate it