very cool! =)
i'd really like to know what you've done (as it's so easy =D )
Fragment and Polar Inversion?
no problem i'll tell you how to do...
Select black color and pencil tool and start scratching like crazy! =P
then go to Effects/blurs/Radial Blur and choose at least 100. you can choose more if you want obviously;
then if not dark enough pick the pencil again and scratch a little bit more in the blank area and then repeat the radial blur process;
then if it is as you wish just go to Effects/distort/polar inversion!
simple and awsome!