I was feeling creative so I decided to make a Portal turret ring!
"Searching...."
Rendered in PhotoView 360
Available for purchase from shapewayshttp://www.shapeways.com/model/305903/portal_turret_ring.html?gid=ug
Portal GLaDOS Ring
OTHER (Other, filesize: 5.12 MB), SLDPRT (SolidWorks, filesize: 1.17 MB)