It's not that hard. I have a tutorial written already. But Daven will just roll his eyes if I say anything. This website keeps him incredible busy.
Here it goes. You will need:
Masking Tape, Pearl Ex, Versamark and a sealer.
Take a dark piece of CS and tape small ripped pieces of masking tape in a criss cross pattern over it. Next dab the entire piece of CS with versamark. Then brush your Pearl ex over it. Wipe of excess with swiffer cloth and stamp over it in black. Then take the tape of and seal the CS. That's it. I have one sample here.
Gallery at Splitcoaststampers
I hope this helps. Hugs and smiles.