For the past several months, I've been learning Rhino in my spare time (actually, I'm beta testing their Mac version). I'm still not all that advanced, but am making progress, and really having fun.
In the future, I really want to 3-D print some larger art/design objects that I create in CAD. To get to that point, I've been assigning myself little projects to help learn Rhino. The projects are jewelry related -jewelry is a great way to learn because the objects are quite small, so I can finish them fairly quickly. And there's the gratification of getting a real, touchable, three-dimensional object in my hands, about 10 days after designing the object – amazing! I've been sending STL files to Shapeways for 3-D printing.
These wireframe diamond earrings are one of the first pieces I designed; Shapeways sent them about two weeks ago. I'm really happy with the way they came out. Since I only ordered one of each material (black detail, white detail, transparent detail, and white strong and flexible), I have to wait till my next order comes in to actually wear a matching pair of diamonds. One of them broke, while I was attaching the jump ring – I think it was the white detail. The white strong and flexible material seems stronger, so I will be using that for my white diamonds in the future.