Green sounds good to me : )

I am with squirrel, green... maybe something around celery or honeydew ...although slow green has a hippie blue-green vibe to it. I could see how a blue-green would feel fresh and young.

I'm posting here just to encourage her to paint her room any color she wants (within reason), and if she gets tired of the color in a year or two, to repaint it any color she wants, with a little help from her friends. Painting a room is a project that a teen or group of teens can handle with adult supervision, and it gives them a great sense of empowerment while (one hopes) showing them that attention to detail matters. Help her find evironmentally friendly low-VOC paint -- that will please a hippie chick (and many moms) more than a particular color. Her father can help her protect all surfaces where paint can spill and buy pizza for any friends she invites to help.

greens (and blues for that matter) cover such a large range-- and there's nothing worse than the wrong color. do you have a picture of the peace sign poster?

"She truly should have been born in the 40's and been a hippie not 1991"

She would have been too old! My brother and sister were both born in the 40's and totally missed the hippie era. I was born in 54 and went through high school and college in the thick of it.

As a young hippie (born in 1957) my first thought was purple with green and blue.

I couldn't agree more with bluekitobsessed--encourage her to go with her gut. Choose the color that calls her name. It's just paint and she can always change it later.

My husband was born in 54 and was I think 13 at Woodstock. He had tickets and everything. I was thinking 48-49 :~) She's an "old soul" and would have been a more responsible kind of hippy. DH was the very picture of sex drugs and rock n roll.

We'll try to take and post a picture of her poster today.

She'll only be there for a year and a half more. She won't live there after she graduates. As it stands now she only lives there every four months and alternating w/e's. She's contemplated just staying here but wants to be politically correct.

Her room here is baby blue, which is her most favorite color. She wants to do something different there. It's something her father and step mom will have to live with for a long time as he's not given to do a lot of work around the house. The addition they're finally finishing started 15 years ago when it was MY house. It not progressing at all is part of why he's not my problem anymore. :~)

My daughter is re-designing our upstairs game room and I introduced her to ratemyspace.hgtv for inspiration. It's so much easier to make paint decisions when you see the color in the context of the room. Your daughter can search on "hippie" even and see what pops up. My daughter Lily has really been able to refine her ideas with this inspiration.

Maybe looking at www.ellenkennon.com will help. The full spectrum paints that change with the different light are fascinating. My bedroom is All, walls & ceiling Sapphire and I love it. It is very calming and peaceful, and makes a rich backdrop for art and focal points. I don't know what her poster is like, but thought of the Sapphire when imagining the peace sign.
And Good for you, letting her express herself creating a safe place just for her.

Have her learn about the color wheel, how primary colors mixed together produce secondaries and how additions of white and black to secondaries create subtler, more refined/subdued tones and shades.

I grew up in home where paint, fabric, and all the attendant "mess" was par for course. While the color "mixing" wasn't about paint, it was all about dyes, boiling water, and immersing blandly colored wools purchased "bulk", and how to dye them to achieve the color requied to "make the color transition" work for the braided rug under construction.

Understanding the "color wheel" and how primaries are combined is the first step toward making wise choice for walls. START with the color wheel.

When my kids do their room they pick their own color and have to say they do a wonderful job of it. I don't want to put my indecision on them on which paint color and if it will work, etc. etc.

Let her go to the paint store and get some chips to decide.

She can always have another paint/pizza party befor she moves out, in their color choise.......for now, it should be a space she Loves!