Just playing around with ideas here. XD
He wears a fez now. Fezzes are cool.
"WOT? I'm a horse? no...smaller than a horse. A pony? No...can't be...I am! I'm a pony! AND STILL NOT GINGER. Ah...hands- I don't have hands! Just hooves! How am I going to use my sonic screwdriver without hands...um...I need a...some sort of transdermal vaccuform cranial interface" - "A what?" - "A suction cup! *stick* There we go, that ought to work, good as new. Hah, look, I'm a unicorn."
(10 minutes or so in MyPaint?)