There's some really cool pre-war designs out there! Here's my favorites:
-1914-15 Cracker Jack... absolutely stunning cards.
-1934-36 Diamond Stars - Pieces of Art! (my only one is here:
http://imgur.com/a/H8uyJ , file too large to attach )
-Zeenuts, 1912 Homerun Kisses, D310's and 1911 Big Eaters - Really cool cards, they have a nice, simple design with a focus on the players. Zeenuts are extra awesome from 1911-1923, the years after that IMO aren't as nice.
-Owen