While we were at Japantown in San Francisco yesterday, we saw some plants being sold in a ball shaped moss covered ball. Looked very nice, clean and serene. I searched online info about it..and it certainly looks awesome especially if arranged hanging from a string.

Just sharing those sites here:
http://www.stringgardens.com/

And here is a site that discusses how it is done:
http://www.cutebonsaitree.com/...