The tool I use to do mine is called a burnisher I got mine from an art supplies shop for $4.00
Step 1:
Get greenstuff
Take your burnisher tool
Step 2-3:
Take your burnisher tool and start pushing holes into the putty downwards and at a angle
Step 4-5:
Go along untill your happy, move down to the next line and repet the same step but at the opposite angle to the first time.
Finished Product:
Repet over and over untill it looks something like this.
Well this is my first Tute so it probably makes no sence at all But i hope it does.
P.S. DONT EAT GREENSTUFF :mad: