Download Variety FX Free Unity.
Variety FX is an extensive set of environmental particle effects that can add an incredible atmosphere to your project.
Webplayer | WebGL | APK | Forum Thread
Featuring a total of 209 prefabs, each containing 1 to 4 particle systems. Most particles are optimized to reduce draw calls by using animation spritesheets. Texture sizes range from 64×64 to 1024×1024, with an average of about 512×512.