I saw this on Reddit and thought, "wow, this is finally a very useful application for 3D printing." The poster's fence post topper was gone, and the product had been discontinued. What did he do? he took a picture of one of the toppers still on the fence, and basically made a copy of it using his Makerbot 3D Printers. The end product, almost perfect. Here's the images and story:

http://imgur.com/a/FPVBR