while I've been

use wire or twine + clothespins to hang across a wall.
make a collage with different frames [hello, Ikea!]
put all the photos into one GIANT frame.
draw your own frames on the wall. [probably not cool with the landlord, but a neat idea.]
or even just tape the photos in a fun shape on the wall.
what do you think? I definitely want to display some of my photography in our new home and I think these all could be great [and inexpensive] ideas for decorating. I also like that the photos can easily be switched out every few months or whenever you need a change of scenery. expect pictures of a finished photo display a few weeks after move-in!