What are some healthy, easy, and good lunch ideas I can take to school?

I'm on weight watchers and I have 27 point a day, keep that in mind. I hate sandwiches unless I can have lots of mayo on them which obviously I can't on a diet. I also don't like salads unless I can have ranch dressing, lots of ranch dressing, which I can only have a little on a diet. I don't have access to a microwave at school so stuff that has to be heated up is out of the question. Any suggestions? Please and thank you! (: