Import the STL file into the print software and print the sculpture. There are a wide variety of software packages that can achieve the same results, such as Silo 3D, which I own and use frequently. Most people don't have access to a 3D printer, but there are several services that can product prints for you for a reasonable price such as http://www.shapeways.com/
I have not used either service yet, but both come highly recommended. Either way, the core concepts remain the same. You have to be aware of the resolution and file size that the output machine can handle, while still getting the level of detail you want. I understand that 3D printing is still rather expensive, but as we continue to find new uses for the technology, the price will continue to drop. The integration of these technologies for artistic purposes allows for the realization of ideas that I never thought I would ever be possible. I hope that you use this method and devise your own to create your own art. Please free to ask any questions and leave please feedback to let me know what you think of my Instructable. Thanks!