Calcbot 2 for iOS has a pretty “lava lamp view”

exc-5589a612e4b0a42ab65f2a1c

No, it can’t appear while you’re doing actual calculations or using the new IAP-enabled unit conversions. But it’s an appreciated detail in the Settings > About screen, which you can reach by pulling down on the history tape at the top of the app, then tapping the Settings gear.

Pick up Calcbot in the App Store for free and grab the $2 IAP to unlock unit conversions and other goodies. Support good developers.