Shadow box ideas for an anniversary present?

My boyfriend %26amp; mine%26#039;s six month anniversary is next month, %26amp; i wanna do something special.. nothing too exstravagant, just a little cute something, so i decided to make him a shadow box. but, i%26#039;m not really sure what to put in it.. i have a ticket stub and some photos but we have a long distance relationship so i don%26#039;t have many other momentos to work with. any ideas would be greatly appreciated! thanks! =]|||Maybe make a collage instead? I mean, since there doesn%26#039;t seem to be a lot to work with.