Depends on exterior color. Looked odd on Iridium. I think Iridium and Silver look best with jet black. Coca/Dark looks good on the whites, red, bronze and champaign.
Shale is beautiful but too lite. We have two kids under 5 and will go with Iridium/Black.
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Here is Amethyst with Coca/Dark. Saw this in person, very cool color. Wife loved it, purple tint.
http://www.peakbuickgmc.com/Vehicle...4WD_4dr_Denali-Colorado_Springs-CO/2391263133
My wife liked the Amethyst too, she called it a girl color. We have chosen the Diamond White exterior. I have a Silverado that is Diamond white and we love it. We do not love the black interior though.