However there's never a good way to organize them: Photo frames are boring (you can't often change photos in them) and they don't always fit. Besides, they cannot have too many photos inside...
But how about this idea: You can use this DIY shelf to store postcards and photos. You can re-arrange them as often as you want even daily always creating a new mood! How brilliant!
Plus with some paint and creativity you can make this shelf look cute!