What can I bring for lunch to school?

I'm trying to eat healthy and maintain my weight, and sometimes I don't know what to bring for lunch. I know many of you would probably suggest bringing sandwiches, but I'm tired of them...I used to bring sandwiches all the time. But now I usually just bring a variety of fruits, since it's fast, not messy, easy to eat, and doesn't need to be reheated. But is eating fruits for lunch healthy? And I don't eat fruits for all 3 meals, just lunch...and sometimes for snacks and including some in my breakfast. So what are some healthy and easy to pack lunches I can bring to school? Any suggestions? Thanks!