I have been 'Googling' a lot of AI blogs...and I noticed that AI Hull#1 seems to have been white. Subsequently it appeared that all the hulls were either Red Hibiscus or Yellow Papaya...
I just ran into a Blog
which proclaimed that the owner had just bought a NEW AI (Fall, 2008) and proudly displayed a dune (WHITE) AI!
It appears that he bought a dune colored Adventure and also the AI upgrade for the Adventure, so that he then had a dune (white) AI!...neat!