I have many times posted about the work of Jon Mirtschin / Geometry Gym (here for example).
Along similar lines, check out this project:
http://www.grasshopper3d.com/forum/topics/grasshopper-to-native-revit-elements
With Mario Guttman involved, it must be taken seriously…
Heads-up:
http://revitturkiye.blogspot.com.au/2013/05/grasshopper-to-native-revit-elements_28.html