As a note, Colorado was introduced as a 2002ti-only color. A photo below shows the ti-only entry in the December 1968 Farb- und Polster-kombinationen brochure. This brochure served as the 1969 model year color brochure. Thus, do NOT expect to see other sub-models from 1969 in factory Colorado! I am curious whether this color exclusivity extended beyond the 1969 model year. By the time of the December 1970 color brochure -- which defines color availability for the 1971 model year -- Colorado is available on all 1600 and 2002 sub-models. Certainly someone here has a copy of the late-1969 color brochure, which should shed some light on whether Colorado was broadly available for the 1970 model year. (Steve, a.k.a., conserv)
I sadly don't have any printed documentation to back anything up here. However, I have seen in the flesh a BMW 2002 produced in 1970 which was still wearing its factory Colorado paintjob. So while Colorado most certainly did start as a 2002ti-only colour, I'm certain that by model year 1970 it was available for every 02.