Wear the complementary colors far away from each other if you are not used to wearing a lot of color. This way you can still add in other neutral colors to tone them down. Or just wear the whole rainbow.
P.S. Don't laugh. The pic on the left was one of my first outfit photos on ze blog! Oh, boy. Okay...now you can laugh.
Wear them close to each other if you want more focus on a certain area. If you are endowed on top, wear the green and red hues on the bottom. If you are fuller on the bottom, wear the green and red on top.
To make a holiday statement, COLOR BLOCK!
Try pairing darker reds and greens this season if you're feeling dark and mysterious...or if it's all you've got.