Coordinated colours, dark blue/grey couch, white, beige and generally neutral textiles and rug The Best of home interior in – Home Decor Ideas
Leather sofa, wall and drape colors
Dark couch/light rug and tables.
an indigo-door-inspired color palette // indigo blue, gray, pale pink, blush
Couch and pillows 5 Fail-Proof Ways to Make Your Home Look More Expensive
light gray walls + dark gray couch + pops of color in rug/pillows/etc
What goes with leather furniture? From Houzz. Nice juxtaposition of the leather sofa with patterned pillows, patterned rug, and aluminum side table and coffee table.