Iceblossom, I'm also intrigued by Bonnie's photo of her ice blues; at first glance, I thought those were her neutrals. Her fabric photos often differ substantially from the paint cards, and this time the blue card is much brighter than her blue prints. I usually follow her lead when there is something distinctive about her fabric pulls, so I've also added some white background blue prints to my blue pile. Her Indigo Way solid red turned out to be quite important to the effect of the pattern.
It will be fascinating to see your monochrome quilt take shape, if you do go that way