Yah, Mudhole sells them and so does Sexyloops.
The sexyloops white rod is a 9' 6 wt. and is designed by one or more of the top distance casters on the planet. (Paul Arden sp.?) It's a gun from what I hear. Not sure if you can get it in white as a blank.
The one from Mudhole is the 9' 5 wt. 4 pc. MHX blank. Supposedly a fast top end type blank. I have no personal information on it one way or the other. The part number is F905-4-W-MHX. It goes for a price of $113.50.
Personally I think you could do some pretty sharp custom stuff on a white blank. If you want to do white you should. I like the idea.