Bare Minerals is definitely natural, and I think Physician's Formula as well. Salma Hayek just came out with a new line for CVS which is a little more budget friendly. I'm not sure if it's completely natural but I know she draws from her heritage. She uses knowledge passed down from her grandmother for natural beauty tricks. I've only tried the eye-liner so far but I absolutely love it - it's very creamy and easy to use, but doesn't smudge.
From the foundation product details:
"Flawless coverage. Skin Adapting Technology balances tone, allowing your skin's natural pigments to show through. Mineral Clays firm and revitalize, giving skin a healthy glow. Rice powder absorbs oil to prevent shine. Vitamins C & E condition and protect skin. Noncomedogenic; hypoallergenic; dermatologist tested; fragrance free; paraben free; not tested on animals."
The promotional write-up: