Maison Reve in Mill Valley has reclaimed objects d'art for your home; it's a perfectly appointed local boutique with a fab online shop. Look at their linen runners (from vintage French seed sacks) for your eco-party!
Also, here are more simply lovely decorations for your eco-party (the kids can help set them up!):
> Smooth stones on cloth napkins
> Wheatgrass centerpieces
> Bamboo cloth tablecloths
> Soy candles
