Xparticles 3.5 with Xparticles Shader with illumination/Phong and XpPPCollisions Tag
Already given a 5-star rating, but I also wanted to provide my two cents in case anyone is unsure about purchasing this theme. Not only is the theme itself very versatile and easy to manipulate, but the support we get in the forum is amazing.
Bookmark this theme as one of your “Must Haves for 2012” This theme is without a doubt one of our Top 5 Purchases. Once you get used to how the content is organised in Admin, the applications are endless. The support for this theme is outstanding. Great job Team Yi!!