Such a great idea! Keepsake box for each trip you take! Via This, That and the Other Thang I love this idea for making a keepsake box full of mementos and pictures from a trip, rather than trying to scrapbook everything
Flowers or feathers would look amazing. maybe next year's apple blossoms! Do multiple of these then frame as if the were window panes. Place a large old frame (outside frame only) around it to form a faux window.