We love this grey kitchen-diner with painted farmhouse furniture. An oversized clock also makes a great focal point.
Family room - Dark Bookshelves (dark cupboard doors too) with white trim Interiors Trend
Color Confidence: 10 Easy-to-Live-With Living Room Paint Colors - Apartment Therapy Main
Bright Midcentury modern living room with some dark colors for accent, like the dark blue sofa.
This blue/green wall colour would look good with the existing colours in the living room. Maybe extend into the dinning room too to tie together.