How I did it.
The Dancing Paint idea was something I had been interested in trying for several years, after I had stumbled upon a Youtube video. So, the Splash theme seemed like a good time to try it. I looked for Youtube videos of how people had done this in the past and though I did not find many, the common theme was to use an old subwoofer speaker. Luckily, I happened to have one. Advice, don’t expect to use it as a regular speaker again.
The first thing I did was take the speaker cover off and cover the speaker with a piece of black plastic (garbage bag), making sure the plastic was right on the speaker and as taught as possible. I wanted everything black except the paint. The paint is just hobby acrylic paint. I chose bright colors and even some fluorescent colors, though I didn’t see any real difference between the typical bright and fluorescent colors in my results. As for the paint thickness, I tried different thicknesses; Straight from the bottle to a 2:1 ratio of water and paint. I concluded that 1:1 ratio of water and paint was the best, but keeping each one slightly different gave a different results to the same vibration of the speaker.