Domain level CSRs were mentioned in a quote from GTGF as being solid color. Sector level are 2 color.
So, taking the knighthood colors (as quoth by whulorigan):
Deneb= Blue & White
Sol= Blue & Gold (Yellow)
Vland= Black & Red
Sylea= Green & White
Ilelish= Black & White
Antares= Black & Green
Gateway= White & Red
The best fit single colors would be (sticking to the heraldric list**):
Deneb= Blue
Sol= Gold (Yellow)
Vland= Red (note that Vilani colors are red in all Traveller line games to date)
Sylea= Purple*
Ilelish= Black (Dlani reference)
Antares= Green
Gateway= White
Each of the four subsectors would have a different color.
* association with Royalty, and to avoid adding less distinct colors
** The heraldric system is a bit convoluted, but, incorproating all of them I've found in my copy of Fox Davies:
- Metals: Silver/White, Gold/Yellow, Skye Blue†, Pink†
- Colors: Black, Blue, Red, Green, Purple, Skye Blue†, Brown†
- Stains: Blood (which is rendered as a brownish red), Mulberry/Murray/Maroon (brownish purple), orange (Tenne - US Military), brown (Tenne - European Continental), light brown (Tenne - UK)
†little used even in the systems where it is allowed as such. Skye is a metal in a couple eastern european contexts; otherwise a color. Pink is used in a handful of achievements by name, and the one that comes to mind is black on pink. Dark Brown is allowed in US military heraldry as brown, and Tennay in french heraldry is a brown not dissimilar to wet sand...[/indent]