These ones are all in a Automatic Sound generator style and all three with beautiful graphical interfaces- simple, elegant black and white.
Maybe the deeper one in way of functions is SphereTones.
After this SoundBow and the one with the least functions but the coolest one is Flux-
Flux the dark ambient instant music maker that goes good visually with ingestion of herbal tea.
There is not much more to add to SphereTones and Soundbow doing what they do,
doing it sounding good.
Flux being original and sounding like no other application there is a desire inside of me that hopes that it will be developed to give a little bit more control as it could be immensely useful for ambient sound making.
If you are interested in what they do more outside of the Android project go to their website:
Here is two videos for one of their projects outside of Android- but remember that they are working on a lot of other projects.
SphereTones have more to give soundwise than what you see in the video, I think it is around ten to twelve different sounds that you can use in different combinations.