Some screenshots I took while experimenting with Panoramical ($10). It's sort of a cross between psychedelic Winamp visualizers and the terrain-building portion of a god game. As you manipulate the environment, trees, clouds, and mountains erupt into being and the music responds accordingly. These screens give you an idea of how adjusting the various settings transforms the pulsing world from soothing to overwhelming:
The launch trailer is by Mr. Div:
Your enjoyment will depend on your enthusiasm for playing with electronic trance music, and indeed a pro version is being marketed to DJs.