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I've been working on some leaves and flowers for a bit and one of the key tricks in adding believability is to add a tiny amount of thickness to the geometry. However, this method falls apart if you have a alpha masked petal/leaf, as the clipping mask in the material chops off your thickened "edge" at render time. Does anyone have a workaround for this?

I can't immediately think of any that would be much fun. Considering for instance a leaf projected on a thin box, you could double the map width, mirroring the left to the right, then wrap, rather than project, this around the box so that it matches up on the opposite sides, and finally apply a matching displacement map, negatively displacing half the thickness of the box. That'd be pretty psychotic, though.

that's tricky for sure.... did you try to add a bump map for the outline that would fake beveled edges? might not work in case you see half of the top and half of bottom side e.g. when the leave is not planar and you look at it from the side...

displace map in sync with the outline? nice mapping on that flower btw.