Water Droplets with Particle Effects in Blender
Software: Blender 2.7.2b
OS: OSX 10.10.2
Project Source: https://youtu.be/RDte-IzvHlg
I found this tutorial on youtube to create the effect of water on glass as though you were looking through a window.
In this case I tried making it look mildly like the water had gotten on the camera lens.
The tutorial was created by Sardi Pax on youtube
I've put the video below