Johnnie Walker Blends

Red (nas)

Black (12yr)

Double Black

Swing

Green: (no grain whisky) 15yr.  Talisker, Cragganmore, Linkwood, and Caol Ila.  and others

Gold (nas now, originally 18yr)

Platinum

Blue: (nas but supposedly min of 28yr)

two grain distilleries and 25+ single malts

rumor - mostly Royal Lochnagar

Speyside and Highland distilleries - Cardhu, Clynelish, Benrinnes