The following table comes from the 56
Pontiac Colors for paint chips showing the colors. Although
color (lower / upper)
Sandlewood Tan (an off-white with a very slight beige tint). Single color.
Sun Beige. Single color.
Sun Beige / Sandlewood Tan
Sandlewood Tan / Sun Beige
Catalina Blue. Single color
Catalina blue / Nimbus Grey. (Nimbus Grey appears to have a very slight bluish tint)
Nimbus Grey / Catalina Blue.
Additional colors were added by Pontiac in the spring of 56. These are called "spring colors". At least one additional color option was added for the Safari.
Avalon Blue / .Nimbus Grey
The color code can be found on the cowl tag. Let me know if you've seen other color codes.
Original single color Safaris seem to be rare and I have never seen one (actually, I have yet to see a 56 Safari with colors that match the code on the cowl tag).