to make separate rooms, use rugs!
High top table and bold rug
I have this rug from crate and barrel and
cups, rug, light, stuff in the kitchen
like solid color chairs on bold patterned rug of same color in a relatively neutral space
When your home has a fairly open layout, it helps to distinguish one space from another with different colors or patterns. By using mainly neutrals in the living and kitchen areas, this home's orange dining area with modern floral rug feels separate and distinct.
rug under Chinese orange chairs sets the dining area apart from the rest of the open floor plan, and it's just plain fun. The Kaley Sculpted rug is no longer available from Pottery Barn, but it sometimes shows up on eBay.