Take a metal trash can and paint it white to make a blank canvas. Then a group of people make a painting on the trash can canvas. When it’s dry you can plant something or just put it in a public place where it would really stand out. Could paint multiple trash cans.
It's something to just see and appreciate. They're meant to be put in areas that might be less clean or not as vibrant. It's very eye-catching and it shows that you can take something so simple and dirty and make it beautiful.