@MattRCan certainly add it here, but I thought it would just clutter the thread.
Several ideas have been adapted from MakeSupply Free Patterns. The base pattern piece is roughly 5.8" x 7.8" rounded rectangle. From this, you can adapt:
midori-style notebook cover (single piece of leather with a few punch locations, elastic cord threaded through to hold soft-bound journal inserts) this would be passport-sized
5x7 photo frame (two pieces of leather, one with a 4.5 x 6.5 cutout in the center for a photo to be slipped in, lace or stitch three sides to hold the frame shut)
Jour