Go Particles

http://fomand.me/goparticles

Go Particles is an interactive visualizer with lots of distinctive beautiful eye-catching effects that will keep you entertained for a long time.
Particles look and feel very alive as they are controlled by multiple properties like gravity, bounce, weight, size, colour, dimension and many more. You can even chain two effects and watch their seamless merging.
Each single particle is aware the neighbouring particles and is affected by them too, what gives us even more spectacular and complex behaviour. App effects are triggered by a combination of touches with panning option for the most of them.

Main features:
24 particle types
20 interactive visual effects
Effects support chaining
2D - 3D smooth transformations
Nodes interact with each other
User controls color for most effects

For the best experience, disable multitasking gestures (Settings->General->Multitasking->Gestures) if they are enabled, otherwise some effects could not be triggered.