Papermywalls sells only authentic natural Grasscloth.

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These natural woven wallcoverings are an environmentally friendly, green decor idea that add intrigue and sophistication to your walls. Our authentic grasscloth wallpaper collection uses the finest eco-chic grasses, paper and bamboo from around the world in a dazzling artistry of weaves and hues for timeless textures and breathtaking depth on walls.

The best pre-mixed paste for grasscloth type papers is Roman Decorating Products' Professional 838 Clear Adhesive used full strength. The reason I emphasize that is because when you dilute a pre-mixed paste you are gambling on the quality of your tap water which may contain minerals that stain. When diluting pastes (or mixing your own potato starch) you can't go wrong if you get a gallon or two of distilled water from the store.