I too am a fan of the atypical Mercedes colors. My 500E is Imperial Grey Pearl. It is a pewter silver color that takes on the character of its sorroundings, like a chamelion almost. Very difficult to photograph. This color was featured on the centerfold picture of the 500E in the Fire and Silk brochure ( German Edition )
When I first started looking for a 500E, I wanted a silver one. When that did not pan out, I found the one IM currently driving.
My 500E is ONE RARE BIRD