I *love* old oddball and regional sets! I especially like college cards that show players who later played professionally. Here are a few:
Jack Patera, who played 7 seasons in the NFL before coaching the Seahawks, on a 1953 U. of Oregon card.
David Beverly, a punter for 7 seasons with the Oilers and Packers, on 1972 Auburn playing card.
Willie Miller, who played 7 seasons for the Browns and Rams, on a 1973 Colorado State card. (Miller served in Vietnam and received a Purple Heart and Silver Star before attending CSU.)
Nat Moore, who played 13 seasons for the Dolphins, on a 1973 U. of Florida playing card.
Gary Jeter, who played 13 seasons for the Giants, Rams, and Patriots, on a 1974 USC Disc.
Finally, Wonderful Terrific Monds Jr., who played 3 seasons for the Ottawa Roughriders and 1 for the San Francisco 49ers, on a 1974 Nebraska playing card. (Monds's son, Mario, also played in the NFL.)