What to make wih feta cheese?

Ok im trying to go healthy and i just bought some feta cheese. and i not sure what i can use it with? i know i can put in on my eggs which is what im going to try. but i want to pack it for lunch sometime for school which means i cant cook it right then and there it has to be able to sit in my bag for few hours without going bad. So any ideas what kind of sandwhich or anything else i can use with feta cheese? thanks!