Try to take advantage of setting the blind more in the shadows and you won't have to worry much about the lack of greens. Also, I believe the Leafy cover would be a great addition by adding leafy movement even in the slightest breeze and this would create the element of realism even more then ANY color would. Also, remember, critters can't really see colors so don't sweat it to much. Good luck and good huntin'

A green based design only seems important to our eyes, not out preys.