It might look like the interior blends into the exterior or something if it's a sea of grey colours. Frankly I can think of a lot of cars I've seen over the years that should have had "not recommended" flagged up before they were bought!
E280CDI Sport Est., CLK 200k Cab., VW T5 174, Citroen C8, and a 2CV!
My C320 is Iridium silver with Alpaca grey. Looks OK IMHO, although Alpaca shows the dirt more than, say, anthracite (I've out anthracite mats in to help in that respect).
Not sure how different tellurite silver is from iridium though?