The Medical Museion at the University of Copenhagen has this interesting sculpture of ATP-Synthase entirely in glass. Take a look at their site. Scroll down to the comments where the artist, Colin Rennie, shares some of his thoughts on the scuplture. It's difficult to really see what it looks like from the photos. I would love to got there to see it myself.
ATP-Synthase is the enzyme responsible for making most of the ATP formed in cells - the main form of stored cellular "energy." The sculpture is based on a crystal structure published in 1999 and available at the Protien Data Bank, PDB ID 1QO1.
By way of IO9.com