I'd go to a VW dealership with a large inventory and look. The choices for 2003 Passats alone (blue & green only) include Fresco Green, Indigo Blue, Blue Anthracite, Blue Silver, Pacific Blue, and Blue Spirit.
Here's a link to an auction with
Fresco Green, my personal favorite.
Here's
Blue Silver.
Here's
Indigo Blue.
Can't go wrong with those last two either.