Not too sure if it's their original idea or they "copied" from another company, but I like Panini's "Private Signings" autograph cards.
Nice design. Clean space for autographs - all on-card (so far).
- certified/pack-pulled autograph card set builder (basketball only and mostly from 90's)
- also collect legends and stars on-card autographs, and anything that catches my eyes (mostly basketball)