Lightning streaks across the sky as lava flows from a volcano in Eyjafjallajokul April 17, 2010. (REUTERS/Lucas Jackson) The Eyjafjallajokull volcano has been providing more than air traffic problems, it has been giving up a lot of very awesome photos of volcanic lightning. Scientists are still not positive the exact process that creates the vibrantly colored lightning, but it certainly is pretty damn cool.

The Big Picture has 2 excellent galleries of images from the volcano, though not all of them are lightning related (look towards the bottom).

http://www.boston.com/bigpicture/2010/04/icelands_disruptive_volcano.html

http://www.boston.com/bigpicture/2010/04/more_from_eyjafjallajokull.html

Geology.com has a good article here about the possible causes and ideas behind volcanic lightning : http://geology.com/articles/volcanic-lightning/