I'm assuming you are taking about the beam? I just pretty much started off with a normal brush stroke of that px size then smudged down the edges with a smaller px size. The sparkle effect was pretty much just touches of a smaller px brush. The hardest part is just to sit there and keep smudging and trial and error until you get it right. The wispy part was done as a seperate effect and then I added it into the rest of the beam. : )
^_^ Yay you're back! Im still using your other awesome pictures as my desktop background. Top noch work for being so rusty though! ^^ I wish i could do that kinda stuff. *high five* glad you are doing your awesome abstract art again.