As I look at cards, I'm probably more interested in the background or action taking place than in the specific player. My latest backdrop search is for different beer ads. Here are my brands so far.
Miller High Life
Budweiser King of Beers
Not a card, but was mixed in
Working on other sports
Budweiser, Coke and Marlboro
HOF'er Bobby Doerr and just the Beer Bottle.
I've got a feeling this is just the "tip of the iceberg"
Next is finding the oldest card with a beer on it.