Hi,
here is my second contribution to shared sources codes.
This is a sample of an implementation I tried of a 2D particle engine to produce texture for 3d objects.
online demo:
http://dzzd.net/SimpleParticle/
source code:
http://dzzd.net/SimpleParticle/sources.zip
I think that water effect may be cool used as a texture (blended with grass or other) onto 3d object like ground to produce rain effect. (for that It may be necessary to make it tilable by flipping verticaly and horizontaly).
Bruno