+1 for clover. I "accidentally" spilled some clover seed outside our place (bugger off HOA), and it's slowly overtaking the grass they planted.

+ a chance at 4-leaf

I spread a bunch of clover seed around my yard, and where the grass was struggling (I don’t water or fertilize at all) the clover took over, and where the grass was doing ok naturally the clover sort of let the grass have that space mostly. Now the whole yard looks nice, and the clover is just fucking loaded with bees all day. It’s great. My dog just lies in the lush clover and watches the bees buzz around.

My yard was infested with bur clover, horrible stuff when you have pets. Worse when your pets are poodle mixes. 

Other clover yeah they chill. 

It's also way less ugly than dandelions that have finished blooming and started spreading seeds, as a bonus. In fact, it looks pleasing to the eye.

IIRC it also grows really easily, you can guerilla plant clover seeds around town at night if you really want to.

If and when I ever get a home first thing I'm doing is planting clover.