I'm strongly considering destroying my chances of ever getting a serious job. What designs should I get for my sleeve tattoos?
Lol! Okay thats interesting, you will want to think of many smaller things that have a unified theme, that is going to cover your entire arm!
Isn't it more fun though just to go into the shop and close your eyes, flip through the design book, and point at something and get that?
Ahh okay so if you were to do that, until your arm is covered, that is different then what is considered to be a sleeve tattoo. Theres an arm covered in tattoos, and then there is a sleeve tattoo.
Oh wait, so a sleeve HAS to have a unifying theme? I didn't actually know that before.
Yes to be considered an actual "sleeve tattoo" the tattoos have to have some kind of overall unity! 
Okay, hit me with the coolest theme you've ever seen for a sleeve tattoo.
Alrighty, Im going to go with, a sleeve of Disney characters! I have also seen a sleeve of Breaking Bad characters!