one good source of photos of white cars is the Porsche "Pre-Owned Search" tool on their website. I used it to look at different colors, wheels, etc. when I was shopping.
http://ucl.porsche.de/ucl/plsql/usa/pages.search_menu
just enter the car model (987), set the color choice (at the bottom) to white and hit search. no need to set all the other choices if you are only interested in color. There were 3 white cars listed -