I just bought a 05 blue onyx pearl color car and I don't see many of them on the street. At certain angles it looks black but at some other angles it looks dark blue.

I would say that greenish color is pretty rare. I've never seen one in person. Black is dime a dozen, but I think looks the most luxurious for the LS.

There's the cherry and brown color which aren't seen as often

Briarwood Pearl is rare. Also, for the 01-03 interior the bordeaux leather is super rare (and nasty!)

I saw a red 01 LS430 once and have never seen another. Blue 04+ seem to be pretty uncommon too.

Black cherry color is fairly rare, except in my town where there are no less than 3 other cherry LS430s that I see regularly around town. My location has more Lexi and LS430s running around in it than any other place I have been to - local area has higher than average income demographic and also very good local Lexus dealers are the likely reason. btw - black cherry looks really good when the car is waxed and clean (the color is deep and glows) but looks very drab and dull on a dirty car. My favorite color on the LS is Briarwood pearl - it also looks great in the Sage color which is also rare.