A scenario for all the artsy-craftsy people out there (and I know there are quite a few):
I have a wall. It's blank. I have photos (standard 4"x6", I think). They're lying in a pile on my desk. I want to get the photos from the desk to the wall. Problem is, I don't have picture frames and I'm too cheap to buy them. I'm not supposed to damage the wall in any way (though a few thumbtack holes is permissible...I hope) and I don't want to damage the photos, either, as they're the only ones I have from home. I don't want to spend a lot on supplies (think college student budget) and my resources are pretty much limited to the local drugstore (like Walgreens, maybe) and the campus student store.
Any ideas are welcome.