Without wanting to go too far off-topic ...I also have nearly all of my original Kenner cardbacks from my childhood collection (and a couple I've picked up more recently).
Here are a couple of examples of my favourites...
SW12C R2-D2:
R5-D4 (must get the modern version of this when it's available locally!!):
MattG wrote:"X-Wing Fighter Pilot" Luke is probably my second favourite carded figure
This figure has always been my favourite ever since I can remember.....I have never seen a carded ESB version but would really love to get my hands on one!!
This Death Squad Commander is a recent acquisition, that I'm quite pleased to have on a "Star Wars" card (an SW20A, with the prototype versions of the Patrol Dewback, Sandcrawler, and the Droid Factory), before he became "Star Destroyer Commander" on the later ESB cards.
This one's not a carded figure, but just wanted to throw it in here. It's a Palitoy (UK) ROTJ 65 cardback...interesting to see the differences between it and the standard US Kenner version (on the right).
Next up is a Weequay figure, on the ROTJ65B card (65 figures in group photo including Chief Chirpa and Logray visible, Chewbacca Bandolier, Y-Wing Fighter and C-3PO Collectors case - same as this one).