It's common nerd knowledge that the Star Wars Holiday Special premiered in 1978 and was swiftly ignored / forgotten (perhaps an ominous omen of George Lucas's reckless retconning to come — the "Ghost of Star Wars Past," as it were).
But there was another holiday tradition that pre-dated even that made-for-TV mess, one which was not-so-swiftly written out of continuity: Star Wars Holiday Cards. Initially designed and created by Ralph McQuarrie, Lucasfilm's then-resident concept artist, the first batch of cards featured R2-D2 and C-3PO in various holiday grabs and were distributed to employees and investors as a fun little celebration of their success with that little space opera that could. As the Star Wars universe continued and evolved, so did the holiday card tradition, folding new characters into that same old yuletide cheer and eventually opening up to new artists and designers as well.
(side note, I appreciate Lucasfilm's forward-thinking commitment to non-denominational holiday cheer, and I think we should all follow in their example and replace all holiday greetings with "May the Force be with you." "And also with you.")
(Perhaps most importantly, there were only 2 years where the cards exclusively focused on the prequels — 1999 and 2000, which makes sense, since The Phantom Menace had just come out. So at least Lucasfilm's holiday corniness didn't give much preference to those cinematic abominations? Because frankly, I don't know if I could handle it if they were given preference over the Holiday Special, since neither a coked-up singing Carrie Fisher nor a script written almost entirely in Wookieese is anywhere near as insufferable as Jar Jar Binks.)
(and for the record: no, I don't know what happened to 1987-1993, whether they didn't send out cards at all, or whether I just couldn't find them online)