We planted clover; it blooms (great for pollinators), spreads fast, is very comfy to sit on, absorbs shock better when you fall on it, has a max length that's much shorter than grass, so you don't really need to mow the lawn unless you prefer it short and leaves less space for other undesireable plants to grow, while not needing much water to stay green (saving water). It's pretty great honestly!
Little fact: clover is edible, so if you feel like eating clover nectar, you'll be able to. I know some people might find that weird, but it tastes very good, which is why many farmers let their bees collect clover nectar to make their honey (it makes sweet/tangy delicious honey, due to how sweet clover nectar tastes to begin with).