I've never been a big user of filters in other apps, but Dithr is in a league of its own. I was lucky enough to be a beta tester for the app, and it didn't take long before I found myself taking pictures and videos of mundane, everyday objects (radio towers, ceiling fans, and even plain white walls), just to see what wild colors and gradients I could get Dithr to produce.
Between the filters, color palettes, and resolution slider, there are plenty of options to play with, and the in-app purchase to shoot Dithr'd video is totally worth it. Dithr's effects can range from subtle to full-on 90s computer game. And I am an especially big fan of the color callout feature, where I can highlight a bright color in an image and turn everything else to black and white.
Highly recommended!