Chose any number of particles between 10000 and 1 million. Optimized for quad core CPUs, on mid end devices you can get over 10 FPS with 1 Million Particles on screen. You can move them with your fingers and/or you can set attractors that will attract or repulse the particles.
You can get the .apk installation package of 1 Million Particles 1.3 free of charge and have a look at users' reviews on Droid Informer. This file size doesn't exceed 2 MB and the app runs flawlessly on Android 2.3.3 and above. This application has been checked for viruses and it has been found completely safe. PureBinary is the developer of 1 Million Particles that can be found in the Entertainment category.