Okay, here is a couple of proto schemes, either shadow grey or shadow grey and the foundation yellow. ( I like the shadow but love the look of the Imperial Fists, so a combination might look good...) The metalics are all bronze, and I've not decided on a logo yet.
At the moment, for the fluff, I am thinking of somthing similar to the Relictors. Perhaps the beaten dregs of a chapter under permanent requisition by a radical inquisitor or somthing. Having read Legion, I really want to tie in to the retconned Alpha Legion stuff, but not 100% sure how yet. If I can sus out, I'll add pics:)