I agree with you completely! I have a Caribbean Blue SL with the SL Preferred Package, Splash Guards, Interior Designer Package and Interior Lighting Package. I've had it for TWO WHOLE WEEKS and I love it!! So fun to drive! I waited FOUR MONTHS for it!
Anyway, about the interior. I wish the gray had been darker or the black lighter! I went with the black simply because it won't show dirt and wear and tear as much. It will show lint, but that can be vacuumed off! The light gray will show dirt in a heartbeat, and we don't have any children.
What I really would have liked with the Caribbean Blue is a medium brown interior. I had a 2001 PT Cruiser previous to the Cube and it had a taupe interior. The seats were leather and suede and never showed any dirt or wear and tear.
Oh well, can't have everything!