Can you give me an idea?

At my school, the graduating 8th graders have to like give back to the school type thing. We call it the "8th grade gift." This year no one really knows what to do, haha. No one can think of anything. In the past, people have planted roses, painted bball hoops, turned around some bleachers, and donated a mirror to the 8th grade clroom(lame, i know.) I was hoping for some original, creative ideas. :) THANKS!