This is only closed beta. Wait till OB and spend all your APs for prettiest mount the item shop has to offer you.
There are two kinds of gamers I suppose. One goes for game-play and the other goes for looks. I'm the former so I cannot possibly understand why a horse must look good for me to mount it. Yes it looks cool but coolness isn't everything. I'd never want a white steed in silver armor which crawls slower than a snail.
But given that Aeria are businessmen looking forward to snag money every possible way, I can totally understand why horses should be like they're painted by an artist.
And for that you have to wait till Open Beta. Or redeem the CB key and get a Lion for 30 days, if that appeals you.