What to do with stuff your ex gives you?

i kept most of the stuff she gave me in a box somewhere out of sight a long time ago, but she also gave me this huge bulletin board with pictures of us and a few other mementos glued on. what do i do with it? i don't want to throw it away because of all the thought and effort put in. but it also doesn't make any sense to keep because we're not together anymore- i'm moved on, she's moved on. we're just friends now. what do you suggest?