I think many of us go back through our "archives" from time to time, even if we're not really doing so just to look for those dusty gems.
I like to go back through old photographs now and then, just to reminisce. I was going through a box of photos from about 5 years ago, when I stumbled across a simple photo of a toddler walking up a hiking trail. The little girl is the niece of a guy I once dated (which is why this photo was hidden in a box). I always thought the photo was adorable.
I felt it was a shame to put the photo back in the box, so I thought, "Why not try it out as stock?" The photo is only a 4x6, so I had it enlarged to 8x12, then scanned it using my home scanner at 300dpi. It took me a good little while to fine-tune it in Photoshop since the film was grainy and the colors washed-out, but I eventually got it brightened up, well saturated, and all of the noise removed. I wasn't sure if it would be accepted or not, but I felt that it deserved a chance.
To my surprise, and delight, it made it. =)