Fotor might be the best thing I've stumbled upon in a while. It's a free online photo editor, plus there's a mobile app. Just add a photo to apply filters, add frames, retouch flaws, or make a collage. There's also an option to make cards. My favorite part (and this goes for all apps/photo editing software) is the ability to change the intensity of a filter. Because sometimes you just need a little enhancement and not an over-worked mess. Be sure to sign up for extra features like frame patterns and brush options.