PMC workshops are out there and well worth the time. The results are a bit on the crude side. If your used to making refined jewelry this is not your medium.
I would like to offer a contrary opinion to this. I have seen
some very refined work done with PMC. See photos in Studio PMC,
Metalsmith, Ornament, Lap. Journal Workshop. Some combinations
of PMC/cast pieces and PMC/enamelling are highly refined and
well executed. As with any material or method, the output is
dependent on the skill of the creator.