Actually, i used a bunch of bifferent brushes. i got them all in one window so i dont know
the name of it. But i might pick out a few.. I basically used those below on both sigs.

Chaos Fractals
Bruses V4 (thats the name of it) and
Onslaught Brushes (might be those you though were renders)

If you want i can give you my psd file on the second one (and first) so you can check
out for yourself.