projectile art

projectile art
On a newish AoS style map called Defence of the Ancients there is a character for the nightelf team, the Ice Maiden, who has a really cool rainbow like projectile art that i hadn't recalled seeing before that...i was wondering if anyone knew where i could find it (for using on a custom spell).

fr0ggE

P.S. I originally posted this in the Animation/Skins etc place but it hasn't gotten any responses. This forum seems to get a lot more traffic, so I'll put it here.