HipnoTouch is a unique OpenSoundControl (OSC) app, "to explore or navigate parametric spaces." I think that is a fancy way of saying it will morph between values for your assigned parameters. It looks cool and it's on sale now for a buck!

Buy HipnoTouch on iTunes: $0.99 (On Sale, from $3.99)

Here is a demo from the developer. They have a few other videos on their YouTube channel.