Get Creative with Accent Materials
Here’s where things get interesting: even though the majority of elements in monochromatic rooms should fit within your prescribed scheme, there’s no hard and fast rule that says everything has to match. Your accents and accessories give you a chance to color outside the lines a little bit.
In the photo above, notice the coffee table has a metal finish to it. That finish is then carried through the rest of the room via decorative vases, lamps, desks, and even in the frame surrounding the wall art. You can do the same with your design, or use another natural material, such as wood or stone.
Other accessories, such as wall art or throw pillows, are also a great way to sneak variety into your design. If you go this route, though, make sure that the items you choose to fulfill this role include your base color in some way. This technique keeps your design looking cohesive, even if it bends the rules a bit.