Starting from an already-made flat structure, some options might be to use the Orient on Surface or Flow Along Surface commands but I don’t think either will ultimately give you the amount of control you’re trying to exact on organic structures.
Since my own interest in Rhino is focused on an ornamental work for a couple of years, I can surely say that really good Rhinoceros baroque models are worth the mad skills that it takes to draw them, hovever slow such work would appear. I even would say that accurate NURBS baroque is one of the best and most beautiful jobs of a most complex shape designs that Rhino can handle.
Here is a simple acanthus I modeled recently. It took me about 6 hours total. Mostly Sweep2 and NetworkSrf with history enabled. You can take a look at the layout of patches, and the construction curves. At the end I cage-edited it a little for my own purposes.
More complex objects require more detailing - trimming, piping, filleting.
You can use it if you like it. Any criticism is welcomed.