No risk of anyone calling the Extreme E500 drab! Looking at my W124 colour charts I can't see that colour. Something I did notice was the large range of colours that were available around 1990. The final update of the W124 (E320 etc.) offered a smaller range. Current models also seem to offer a smaller colour choice. Looking at some dealerships, it appears to be "any colour you want so long as it is silver".

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.