I realise this isn't 'realistic', but perhaps something a little weird might be okay? All good if not. XD
Black coat with red 'hair', vaguelly modelled on the colouring
ofGideon Nav from the Locked Tomb series.
The 'skull' for curiousity reasons, looks like this. Vague skull-shaped splotch, maybe?
But really, just a badass looking horse with black coat and red mane/tail would be so cool! Like a biker devil horse? XD
Thanks friendo for this generous offer!!
If you'd prefer something ACTUALLY realistic, I'm a sucker for buckskin and blood or seal bays. Or blue taffy. XD Basically anything!