Frustrating. Why do you have client briefs? The client likes the color green, use it in your design. My design is currently in 5th place and it is the first one to have a drop of green in it. Right now, it seems that actually following directions puts you in the bottom. If you are going to continue to have briefs, then either disqualify those that don't follow it, have the color selection as the only choice in some part of the preselected materials, or make voters aware of requirements.