While LL has disappointed (at least for the time being) those hoping for rigged mesh that conforms to our avatar shapes, mesh can be a pretty cool thing unrigged as well. The latest release from Tekeli-li, the Crystalism set, is a non-rigged mesh set which weighs in at ... very few prims indeed. The necklace is one prim, the top and the bottom three prims each.
The skin, Ariadne, is a brand new release from Adam n Eve which I am dying to do a dedicated post on, so keep an eye out for that. Or better yet, just run over there and grab a demo right off.