I think there are induvidual Pokemon of each type that are attractive design wise.
Ice, Normal, Poison, Ghost, Dark and Grass are my favorites. I voted Ice on the poll.
Ice: Ice is what I relate to the most, element wise. I don't know why.
Poison: I think if I was a Pokemon, Poison would be the type I'd want to be.
Normal: People overlook Normal all the time, but there are many hidden gems in the Normal type. Like Cinccino.
Ghost: I think Ghost type moves like Curse just have the coolest effects. And a lot of Ghost moves look cool in the games and anime.
Dark: Some of my favorite designs are Dark. Houndoom, Absol, Krookodile, Zoroark, Weavile, Umbreon.. They just look the most "badass" to me.
Grass: I usually use Grass starters. Grass is another type, like Normal, that is overlooked (probably for a valid reason though- they have many weaknesses.) and I think they actually have a lot of potential and their HP regaining moves (Leech Seed, Giga Drain, Horn Leech, etc.,) minimize their many weaknesses.