If you are into photography and have a portfolio of quality images (it doesn't really matter what the photos are of, as there is a market for every kind of image), then selling your photos on stock photography sites is a way to make some money and set up another online income stream.

You won't get paid much per download, and there is a bit of a process to go through to upload the images, write titles and descriptions and loads of tags, then the approval process, but once you have your photos online it's pretty mush a set-and-forget scenario and a true passive income stream.

Possibly a better idea would be to create your own photography website here through Wealthy Affiliate and sell your own photos on your own website, therefore keeping all of the money. There are loads of website templates that are dedicated to photographer sites, and having your own photography website would come up looking amazing!