What's more simple than growing grass? Seriously, I could grow you as many containers full of grass as you want.
grassy paving - put mother-of-thyme or other low-growers that don't need mowing, and use it for parking lots instead of asphalt. Most wil survive. What doesn't - put asphalt there only. And you will end up with a less heated, more water-absorbent surface, much healthier and greener.