Green and red- opposites that they are, have the most contrast to each other. One trick is SOFTEN THE CONTRAST by using less intense shades of one or both hues. This wall is a very pure green, but it's fairly light. The red here is very dark and lush, more of a maroon shade — which can work as a neutral. Also, because the colors are used for different items in the room (wall paint and furniture), they won't conflict. This unexpected palette works really well in this cool, modern space.
my blue and orange
muted blue and peach
On the color wheel: Analogous (nearby) colors contrast just a little, and so have a calmer, softer vibe. Complementary colors (across the wheel) contrast a lot, and so have higher energy, adding drama.