I have never been tempted to put baseball cards in my spokes...not as a kid, and certainly not now. Just never got the appeal of all that racket.
However, I would love to have an old Schwinn Stingray like the kind that all the neighborhood kids who did put baseball cards in their spokes had, now. Banana seat, ape-hanger bars, 20" wheels, coaster brake...or, even better, one of their Krates, with the coil spring fork, shock absorbers on the seat supports, 5-speed Hurst-style shifter, drum brakes, 16" front wheel...those were awesome! I'd do wheelies and jump curbs and rediscover what riding sans agenda was all about.
Wonder if Dave Kirk or Carl Strong would make me a custom-fit adult Stingray?