With photos mounted outside its glass, this photo display pretties up a home office—and makes it easy to swap in new images. Clean up an old single-pane window. Use glass-etching cream and painter’s tape to create four frosted squares on the glass; each should be 1 inch bigger than the photos. Position photo corners on the outside of the glass; insert pictures. Back glass with a favorite wrapping paper, then write captions using a dry-erase marker.