Step 1: Step 1
which i have here - http://code.google.com/p/silhouettepdn/
If you dont know how to install it google it up on how to do that.
After you have that put in make sure the image that you want to be blacked out has all the other stuff from the image transparent. Then make a new image of any size, preferably 600x600.
Step 2: Step 2
Then the image should be all blacked out. Next make 2 white lines coming from the ear-ish areas on the sillouhette meeting at some point, then continuing to near the blacked out things pocket or waist area.
Step 3: Step 3
Step 4: Step 4 & Finish
In this case I used torchic to it became iTorch. The apple logo is optional.