For what you require, exactly: Graffle=No; PS=Yes.
Hah! Never say "you can't" (saying that to myself here). I just tried something. A method, which is very simple in Graffle, as all things are in Graffle. The result is straight two dimensional (my concept of toffee is three dimensions). You can play with that, depends what you want, and how much you want to play. I used one of my stencils (flat 2D); plus Chris Heath's Glass Buttons to give it bit of depth and toffee feel.
Instructions (not marketing strokes):
• Load the image of the stencil into the object (here a rectangle with a corner radius, piece of toffee)
• generally be aware of when you want to treat it as a group-of-objets or a true group
• Edit/MakePointsEditable
•*Double-Click on the edge if you want to add a edit-point
• Command-drag any edit-point, in order to get a pair of bezier-handles
• then drag one or both bezier-handles to get the stretched effect
Not quite toffee or 3D, I realise you want the stencil on the skin of the toffee, but that's the best I can do right now.
Last edited by DerekAsirvadem; 2010-05-27 at 04:43 AM..