I'm supposed to be a summer. Laura, if I recall correctly, they look at the skin on your wrist and if you have blue undertones you wear cool tones (summer or winter). My DD's and I all have blue undertones - in fact, you can even see blue veins just under our eyes.
So yes, cool vs warm. Ana is the perfect example of a spring. And -in general- if you gravitate towards Jcrew colors, you are probably a spring. That's my theory at any rate, because many of their colors tend to be best suited for springs. Michele Obama is a spring.
Inge's got it exactly right: summers can indeed wear green. It's one of my favorite colors. Try teal - which has blue mixed into the green. Yellow is very difficult though. As for red, I look for reds with a blue base - so a cranberry works better than a tomato.
I don't know if it's so much that the color needs to be "greyed down"... rather, it needs a hint of blue to it.
Nicole, I have a hunch your coloring is similar to mine. If I didn't dye my hair, it would be a reddish dark blonde. I have red undertones (the irish in me) to my hair, hazel eyes, and blue-based skin tone. When I have my hair highlighted, it looks horrible if the highlights are golden and just as horrible if they are ashy; I need neutral highlights.
I can sometimes get away with Fall colors - especially when my highlights are growing out and my hair is darker. Yet, not in the way my sister and Greenglove do. They are both Falls with auburn hair and orange/golden undertones to the skin. So Falls I can wear, and look good in, but they aren't my "best" colors.
Meanwhile my mother is a winter - her hair was auburn as a child, like my sister's, but her skin tone is not golden like my sister's - it is more blue-based like mine - but her skin is much more fair than mine is - her skin is practically milky white. She looks great in optical white. Otherwise, she would find the colors at BR right now right down her alley.... that "dried rose" would look gorgeous on her. It washes me out completely. Even if it is "greyed down"!
I can wear white but it is true every time I try on white raincoats something just doesn't seem right. I feel like I'm wearing a lab coat and the white is washing me out. My mango coat, I guess, is more of a cream or winter white, and texture may play a role here.
At any rate, the best way to find your colors is to just develop an eye. If you wear a color and it makes you feel good and look good - then that is your color. If instead people tell you that you look washed out or tired, then that is not your color! (or you're menstruating, LOL... I think there may indeed be some truth to that!!!)