I think it can be easy to fall into thinking that plain coutil is not a decorative fabric choice, but that doesn't have to be the case. Aside from how beautiful the fine herringbone coutil is by itself, it is also a wonderful base for draping and/or embellishment, which is what we did with Red Hearts. Bubblegum pink tulle is wrapped across the corset and gathered behind the bustline, whilst layered laces in gold, vanille, neutral-pink and pink/gold add texture. Rose quartz chips and freshwater pearls give a level of opulence that I personally love.
Of course, any of these ideas can be explored in more subtle (or more dramatic!) ways. You could use coloured tulle flatlined to coutil (or sheer) panels to create an interesting corset. You could completely cover a design in pearls (as my intern Emiah Couture is currently doing on a project of her own), drape different qualities and colours of silk in a more voluminous manner, stick to one lace or layer multiple laces, etc. etc.
For my part, as Birds Wings are quite complicated in the first place, I try to keep their construction as simple and streamlined as possible. Beautiful quality coutils (herringbone, sateen, broche, etc.) allow you to do this with minimal bulk, in comparison to most corset construction. I suppose the basic premise is to shift the balance in terms of where your time goes... I like to streamline the construction and elaborate on the embellishment!