Single color selection as a unifying factor.
I have no experience or knowledge about interior designing but this is true. When I enter a house or room, when there are multiple colors I tend to have a headache haha but when the design of the interior has similar colors, I tend to get attracted to the ambiance! and it's soothing to the eyes 😍😍😍🤗
Choosing single color is good for the eyes too. That's important for eclectic style :)