1. The badge came with Slowscan, Ghost, Unstabilize and Dither. I decided to make a generic kernel/ convolution matrix processing function I could use in a variety of ways. more about that later.
2. The UI came with an "Effect" button that looped through the effects. I changed it so there's a forward and back button. Genius, right?
3. I thought saving the processed image was going to be the hardest part, but like so many of these hacking situations - it's all in reusing what you can.
4. Adding HW to adjust the effects seemed easy enough at first.... but the corollary to #3 is it's easy (or perhaps just to me) to misunderstand and misuse existing code.

Details on each to follow.