Please excuse the duplication if I have already suggested this, but how about printing up a few of your photos, framing some of them, and hanging them at someplace like a swap meet? You could print out some onto perforated magnetic paper for a lower price item.
For a lower start-up cost, if you had the ability to burn CDs, could you put some images together in wallpaper size on a CD and sell them as a screensaver? We recently paid ten bucks for 350 images of Las Vegas that can be used as a screensaver and about 100 of them were tilted, poorly lighted, or out of focus.