Mate just reading a list of all the craftworlds...
What do yout think about this one?
Yme-Loc
The Eldar of Yme-Loc are talented artisans, and their armies are supported by powerful grav-tanks and Titans. Yme-Loc's Guardians wear grey uniforms with orange helmets and armor. Their mighty Titans and other vehicles are often colored grey with orange details.
Easy to do with your existing colour. A firey tiger like orange ont he helms could be a startling stabd out point as well...