Pre 1966 adds usually just list red yellow and blue for color choices if they list colors at all. 1967 models started showing colors in the brochures if they were sold as assembled (the '66 literature I have does not show color choices-someone else might have something more extensive from that time though. They only offered the 400-450-500 as of June 1, 1966)
From Feb, 1st 1967 dated sales brochure
400 Standard blue enamel on assembled (came in a spray can on the kit version)
450 Apache gold- vibro enamel (there is an original example survivor one of these on ebay right now if I am not mistaken)
500 Prairie blue -vibro enamel (Member TomS has an original survivor example on of these)
600 Indian Red- vibro enamel
The next season of bikes, the Century and Grand names came into play. I would imagine these were being created in later 1967 but would be 1968 models. Those names were used to differentiate the now 2 very different versions of bikes they were making. Century being the small frames 400-now 700 models and Grand being the larger, usually fully suspended frames 4000-6000 models at that time.
The color choices in 1967 stayed with the lineup into 1968 catalog, only exception I see is in the parts listing standard blue is dropped for standard red. Also they only list colors on the models that are NOT offered as kits with exception to one model...the 4500