Ladder picture display- Just hang hooks under each step and attach photo. 20 Creative Ladder Ideas for Home Decoration, http://hative.com/creative-ladder-ideas-for-home-decoration/,
Simple frames of the same color in different sizes on off-set floating shelves with larger framed & matted photos hung on the wall make an attractive "Gallery Wall" layout. (Easy to change too.)
Spacious Tiny House Living in Richs Portable Cabins. The space under these steps has been smartly put into use for storage or a washer dryer combo. Note that it is what Rich's website calls a "stand up stairs" - no ducking required to climb up.
Create a Gallery Wall - Ideas for Picture Frame Displays
DIY Wired photo rack. Gallery Wall Ideas and Inspiration for PIcture Frame Displays. Family picture frame ideas and ornament for displaying your home portraits.
bedroom wall art
You And Me with 12x16 Picture Frame - Custom Barnwood Frames. This would be fun to make!