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davidcycleback1950s-70s Odd Balls has a lot of neat stuff, ranging from the 1954 Red Heart (another's pick but worth seconding) to Topps test issues to the 1970s Kellogs 3-D cards. A lot of these issues have star players' rookie cards and pre-rookie cards, and most issues are rarer than the regular Topps cards.
In fact, it would be a worthy focus to collect odd ball rookie and pre-rookie cards. 1975 Hostess Robin Yount, 1957 Swift Meats Rocky Colavito, 1978 Kelloggs Eddie Murray, 1969 Topps Decal Reggie Jackson. There are similar odd ball rookies of football stars too. Many of the cards would be fairly inexpensive, especially if you're dealing with more modern players, and it might end up to be as fine collection.
Above: Swift Meats Frank Robinson Rookie. Am I the only one who finds it odd that a meat manufacturer would issue baseball cards that are die-cut human body parts?