I put slivered almonds, mini chocolate chips and dried cranberries in mine, although the right side of the pan is sans the cranberries for the girl. I think my son will like them.
They didn't really hold together great, so I don't know if they're gonna work for lunch box purposes. But they are really yummy, not as dry as store bought granola bars. A commenter at Allrecipes suggested freezing them before slicing them to help them not fall apart. I'm really not that patient though. I think I'll try putting some rice krispies in there next time too.