I thought that maybe some of you may find this interesting. I have been playing around with these techniques for what I am calling extrusion melding.

In DP7 you can use live copies with most transparencies to create an image with layers of extrusions. Opacity masks seem to be a little weird with this, as editing the extrusion with in the live copy seems to cause the opacity mask to go from being applied to only one of the group to being applied globally or to all of the group.

The chocolate biscuit example uses a simple cut out from a regular copy, which is layered on top.

I have included a .xar file you can pull apart and experiment with.

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extrusionmelding.xar