DIGI CAM OBSCURA
I have this 10 year old little camera, Fuji Finepix S5100...it was a kind of advanced point-and-shoot when it came out. It's only 4 megapixels, which is less than a cell phone these days!
I haven't used it in ages, but since it still works, I thought I'd do something interesting with it. I took apart a magnifier and attached the glass to the camera (over the non-removable existing lens) with some gaffer tape. I really like the blurred, old camera-like effect it produces. I did some basic adjustments and added grain in Lightroom, otherwise no special filters or photoshop.