Instead of grass

A neighbor several houses up the road has this tiny plant in their front lawn instead of grass. Now that it's been raining a lot, the plant has sprouted some cute, little yellow flowers less than an inch long. I think it looks great, though I have no idea what the plant's called. Of course, when I pass their house, I keep wondering if they'll feel great to walk on with bare feet too. Maybe one of these days I'll just take off my sandals and try it, and just hope they won't notice any crushed areas.