if you want to turn a chip to the side just select the chip invert the selection and delete the surrounding pixels. Free Transform the chip to the angle you require. Ctrl click on the thumbnail in the Layer Palette to select it and press Ctrl + Alt and tap the Up arrow key and it will extrude the chip to the required depth - job's a good 'un.

(,
Wed 6 May 2009, 18:28,
archived)

and then Shift+Alt click on the Layer Palette's thumbnail and that will switch the selection to the extruded edge only - you can dodge and burn some shadows and highlights or smooth out some of those lines by locking the layer's transparency and using a Guassian Blur.
(,
Wed 6 May 2009, 18:48,
archived)
