I worked on GREEN LANTERN at Sony Imageworks.
The opening shots show this electrical effect coming from some guy's finger. Then there are a lot of shots where I provided layers of misty particle renders for the "constructs" that GREEN LANTERN makes. And then the end shots show more misty particle renders plus fluid based explosion elements as the ring blasts hit the big, ugly space creature.
All Houdini particles and fluids, using Sony's SVEA renderer.