Stripeout
One of the simplest animations I've created, but also one of the most impactful. The cycling between individual columns and broad sweeps is a nice effect. Originally the sweep selection was completely random, but this had a negative side effect that as the screen filled up, the sweeps would only hit a handful of columns at a time, slowing down the time to wipe the entire screen. I added some code to ensure that the sweeps would always cover as many columns as possible, keeping the animation from dragging out.