Attached Link: http://www.renderosity.com/viewed.ez?galleryid=1093857&Start=1&Artist=deci6el&ByArtist=Yes

Here's an example of the glass filter in Photoshop when I needed some air turbulance. It's fine for a single frame. If you're doing an animation you'll need to go to After Effects or something like it. I would Always recommend using some kind of 2D noise displacement over trying to do this with particles as the time investment for similar results would not be worth it. (IMO)