I bought a few old lenses last year, I only really have decent photos of one that I took with another.
They are all photos of a 35mm lens I bought which is usually used for security cameras. I bought it because it is small and cheap, and because it is cheap it was likely to have faults in the lens that would produce interesting images. and even if it didn't do that it still looks cool anyway.
The photos were taken on my Panasonic GH4 using a Canon 50mm FDn lens that I bought and had some trouble adapting it to my camera, but it was worth the trouble because it can get a very very shallow depth of field which I particularly enjoy.