Share 'Tubes in grasshopper'

Hi I am fairly new to grasshopper and I was wondering on how one would create tube like objects that lays over an irregular surface like a sphere. My idea I am trying to replicate is like how tree vines pan over a surface like this picture. http://www.flickr.com/photos/fantasticthings/4490952210/ Any links, tutorials or downloads to definitions would be much appreciated or something similar to…