Years ago I organised a 'Breed Challenge' on the then infant Online Guild. Someone dyed some of my Heb fleece and before I saw it I thought it was a waste of time. It came out really well though, with the paler parts (from old lady fleeces) taking up the dye quite strongly. The darker parts just take on a tinge, but again that's interesting.
I'm looking forward to seeing how your CM fleeces come out
Dark fleeces look good too plied with lumpily spun coloured silk - let's be honest, all my spun silk comes out lumpy