Rustic Wedding Flowers What Would Be A Good Wedding Color Flower Palette For This Theme?

What would be a good wedding color flower palette for this theme? - rustic wedding flowers

The wedding colors are gray and yellow. However, there is a striking bright yellow, but a kind of soft butter yellow. Many yellow flowers you see are bright yellow, super, and do not want that. Suggestions? The bride looks yellow roses, but do not want here is a bright yellow color blind. This is a rustic outdoor wedding in the summer in South Dakota.