I have actually put a lot of thought into this in the past.... This is what I WOULD be. Not what I would WANT to be.
I would be a Dartmoor pony (the pony brain is strong with this one, as well I have my not to big not to small, hardy build)
Blood bay with full stockings (not a natural red head but always have and always look best with red hair, and bay because I am kinda common and not to outrageously flashy.)
Bird catcher spots (I am just odd and would like to show it)
I would probably be someone's hobby horse. Bombproof and know my stuff but would never see a show. (I have ridden in many styles and disciplines but ride only for fun and I have never once competed)
Name...hmmm.... probably Spark, show name (that would never be used) Signal Fire