Step 1: Scan a lawn gnome with a MakerBot Digitizer
Step 2: Get a 3D portrait of your head at the MakerBot Store
Step 3: ...
Step 4: PROFIT!
You guys... Personalized custom lawn gnomes... it's a brave new world.
Check out the Gnome Remix Challenge! http://www.makerbot.com/blog/2013/09/11/thingiverse-gnome-remix-flash-challenge/