Originally wrote this as an e-mail to a friend but thought we should post this as well. Our friend has mentioned that she has been in a bit of a creative slump with her photography recently, so when I came across this article, I thought of her: Explore Photoshop Mix and Fix with Visual Artist Amr Elshamy.
I do pretty much all of my cell phone processing using Snapseed, but I also have Photoshop Express, Ps Fix, Ps Mix, Prisma and some other apps installed. They’re all free. Prisma does offer an annual subscription plan but if you’re not interested you can ignore that. Prisma is pretty much a one-trick pony, but the one thing you can do is to swipe left/right to vary the amount of effect from the filter you’ve chosen. For any given image most of the filters will look terrible, but there are usually one or two that look good.