I started a side project with my older brother called NanaGram.co that makes it easy to text message photos to a unique phone number, then once a month they get printed and shipped to your loved ones.
If you have kids, it makes a good holiday gift for the grandparents if you're stumped on what to get them.
I've since moved on from it, but my brother makes enough to work on NanaGram full-time now. It's also just been really cool to see the project grow over the years and bring happiness to thousands of grandparents all over the world.