By nature, no two slats of wood, strands of grass, bamboo or reeds are exactly the same. Slight color, grain and texture variations should be expected and cherished for their unique beauty. With any type of natural product, slight shrinkage, stretching and warping may occur over time this is inherent of the product and not considered a defects. Bamboo in particular maybe tan, yellow, green or brown depending on when the bamboo is harvested.
In addition to the above considerations regarding color, we'd like to suggest that you order all of your blinds of a given color at one time. There are sometimes slight variations between dye lots.