Sun Flares

hi, can somebody give me an example or tell me how can i do sun flares like this?: http://www.youtube.com/watch?v=L3nfVTBcG18&feature=related like at 0:19, 0:35 and 0:37? please help :smiley:

idk if it works in the ge, but i usually just use a single vertex and put a halo material on it.