Photomosh is one of the coolest online image editing things I've ever seen. With as little as four clicks, you can turn a boring image into a GIF with vintage TV effects. It gives images this reclaimed, thrift-store feel. I used it to make little GIF avatars for my Medium account:
Simply drop an image in there and click "Mosh" and you're done. You can save the live animation as a static JPG or as a GIF. You can even use your webcam to record with a glitch effect right from your browser!
Try it out: https://photomosh.com/