I was holding off on requesting this for now but I'll add the "Me too" for the single pixel chase.
It would look great on a pixel tree starting on the bottom row, chasing L to R, or R to L and then moving up a row until all rows were lit up.
Then we could stand out by our trees and proudly count off as it lit up, 24, 48, 72, 96, all the way up to 1800+ ha!
Sean, since you're going to do it, I would add the options to chose 1-10 pixels at a time, draw or fill, accellerate, 1-4 rows at time, and probably something to do with colors.
If I knew how to code, I'd help out. This looks like fun.