Consider taking a two by one inch Red Oak board, about six feet in length and router the long edges for looks and tack it to the ceiling/wall area.
If you use more than one board for a longer wall, make 45° cuts in the meeting ends of each board, so to make an over and under lap, it'll look better.
Buy some brass, frameless "L" shaped holder, with their built in threads and space these evenly alone the board(s) to a bit over half the width/profile of the paper sizes you'll be displaying.
Hang nice ribbons from the "L" brackets and use super magnets behind the ribbon and use it's counter part on the surface to hold flat or matted prints vertically down the length from near celling hight, to where you want to end the displace.
The ribbons will work best as hangers if you get a small, clothes rivet kit from Walmart or a fabric store.
This will give a cleaner appearance at the hanger position, slipped over the L brackets and if used on the bottom end, a clean hanging point for small weights to keep the photos from flying about.
Oval black or painted river stones would make nice, simple weights and you've now made a display for a few dollars that can be taken down without major injury to the walls.