Eggshell is beautiful, it's definitely a "go-to" color if you like simple / elegance. We are gonna go "white'ish" with a tint of blue or grey.
Just a quick note, eggshell is a type of paint which, when it dries has a similar finish to that of an egg. It's good for hiding small defects in a wall, holds up longer over time and is a relatively "flat" paint (not much of a sheen to it).
I'm a big fan of Dudleys Hardware (I like to support good local businesses), they are on the east side of Church Street about 5 stores north of Wellesley and they sell Benjamin Moore paints. The super friendly staff there will show you the difference between various paint finishes (eggshell, enamel, semi-gloss etc.) and will even help you with the the colours and shades your looking for.