My favorite design is the Pink striped one. My second favorite one is the orange with circles one. (By the way, I'm in the U.S.) I'm probably going to get a V4 this week or on the weekend or something! Yay! I really hope they have the pink striped one!!!!!!!!
Edit: I kind of like the sunflower one, but not a lot, and I don't like the red and yellow one cuz it's boring and it reminds me of ketchup and mustard. Ugh! I don't like the glow in the dark one cuz it's ugly. It would be cool if all the designs were glow in the dark, though. And the blue one with waves is kind of plain and it's kina ugly. (no offense to anyone who likes the ones i don't like, i'm not saying you have bad taste or anything, i'm just saying my opinion.)