Producing bookmarks with your photos provides another mechanism for you to share your photos, and can also provide a way to publicise your website. Bookmarks can also make attractive gifts, and can easily be slipped inside an envelope along with a card.
If you run a photography business, you can also use these bookmarks to advertise your business.

completed bookmarks

With photo-quality printers becoming cheaply and readily available, many people will be able to make these photo bookmarks at home. (However, many people may not have a laminator at home. Laminators are reasonably cheap, and many printing places provide laminating services. Alternatively, your workpace may have one, so ask if you can use it.)