You can see the difference between Benjamin Moore Wythe Blue HC-143 (in the centre) and Benjamin Moore Colour Stories Antique Glass CSP-695. Wythe Blue contains grey in the colour which tones down the intensity level.
Beautifully Beachy-Benjamin Moore Beacon Gray - gray with blue undertones that shows as a beautiful neutral light blue. Used this as the main entry/foyer/great room and up to cathedral ceilings in all those spaces and if was gorgeous. So light and airy.
If you want to make a statement with color but don't want anything too loud, consider a palette of deep navy blue with lighter shades of gray-blue. The result will be calm and cool. Clockwise from top left (all from Benjamin Moore): Mineral Alloy 1622, Silver Mist 1619 and Hudson Bay 1680.