So here's the extrusion tool I was referring to, in progress.  What you are looking at here is the control panel for the extrusion operation on the right, and some "helper" objects, which are automatically attached to a spline, along which the extruded polygons follow.  These helper objects act like rigging controls for the extruded polys, and by manipulating their position in the viewport, I'm able to change the shape of my extruded polygons any way I like.  Once I'm satisfied I have the extrusion shape I'm after, I can commit to the operation, and lock in my results.  It's useful for things like horns, because as you're extruding and shaping the extrusion, you can also specify twist values and taper radius, to create some interesting effects in the mesh.

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