Here's one I just came across (well, I just noticed it was a one-shot pairing, that is)--

CHAMPIONS #11 penciled by Gil Kane and inked by Bob Layton

I'm always pleasantly surprised when I find out that two big artists of my childhood who I didn't think ever worked together--did!

That said, and though it's a nice cover, it's clear that Layton over Kane is not the best pairing.  Since so many of these one-shot pairings were covers, it makes me wonder if covers were just fairly randomly given to whatever inker was around or available or if it was more of an intentional experiment editors did with a mind towards using those teams again for long-term series.

BLUE RIBBON COMICS #5 penciled by Jack Kirby and inked by Rich Buckler

With their similarities and shared titles, I'm surprised that Kirby and Buckler didn't work together more often!  Since Kirby didn't do anything else for Red Circle, I assume that this was a left-over piece that Buckler found to finish?

BLUE RIBBON COMICS #3 penciled by Alan Weiss and inked by Rudy Nebres

I don't know what the editor was thinking pairing the super-finelined pencils of Alan Weiss with the super-heavy & overwhelming inks of Rudy Nebres, but the final result is quite strong.

LANCELOT STRONG #1 penciled by Alan Weiss and inked by John Severin

Here's another pairing I never thought would have worked, but John Severin did a great job finishing Weiss' pencils.

BLACK HOOD #1 laid out by Rich Buckler and finished by Alex Toth (with Gray Morrow insert)

I can see some of Buckler in the Red Hood on the motorcycle, but Toth certainly took the whole thing and made it his own!

COMET #2 penciled by Carmine Infantino and Inked by Alex Nino

'Tino and Nino!  An odd mix, but not bad.

COMET #1 penciled by Carmine Infantino and Inked by Alex Nino

I can hardly think of two artists more different than the loose/fluid Carmine Infantino and the blocky/splotchy/jagged Alex Nino, but sometimes pairing diverse artists is one of the things that makes comics interesting!

To me it has the look of later Kirby work.  Kirby was close to being retired from comics by this point... I think the only interior art he did on a comic after this was the second Super Powers miniseries.  So my guess is that Buckler simply commissioned him to do a new cover for this reprint collection, and Kirby wasn't interested in doing anything else for the company.  Buckler also got Steranko to do a couple covers for The Fly #1 and #2 around the same time.     

JACK KIRBY'S SECRET CITY #2 penciled by Steve Ditko and inked by John Byrne (with Clinton's face by Angelo Torres)

JACK KIRBY'S SECRET CITY #3 penciled by Steve Ditko and inked by Bill Sienkiewicz

JACK KIRBY'S SECRET CITY #4 penciled by Steve Ditko and inked by George Perez

If I may mindread a little bit, it appears that maybe Byrne and Perez enjoy partaking of the Ditko feel more than the others.

I mentioned this over in the Ditko thread but it fits here too.  The first ten pages of Micronauts Annual #2 are pencilled by Rich Buckler and inked by Steve Ditko (with the remainder of the issue both pencilled and inked by Ditko).  I'm pretty sure this was the only post-60s instance in which Ditko inked another artist.  Kind of an oil/water combo:

A few years ago (it had to be before Wrightson passed away in 2017), I visited Neal Adams at his booth at San Diego Comic-Con and it was just the two of us for a couple of minutes and he kept working on a commission piece as we talked.  (He was always working on something!)

I honestly don't remember if it was this exact piece (I found online) or not, but he was busily and happily inking a Swamp Thing (lightly) penciled by Bernie Wrightson.  I think he said Wrightson was paying him $500 to ink it (to resell? or it was already sold?), but I think he would have inked it for free he was enjoying himself so much!  There I was, always a little nervous the couple of minutes every year I talked to the legendary Mr. Adams, and he was talking a bit like a fan about Wrightson!

(I remember him inking Swamp Thing's head, so I don't remember if it was a different picture or if he just hadn't gotten around to the arms yet.)

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I love that cover! If they did interior work, I'd love to see it. Google wasn't pulling anything up for me.

ADVENTURES ON THE PLANET OF THE APES #6 penciled by Jim Starlin and inked by Klaus Janson

ADVENTURES ON THE PLANET OF THE APES #7 penciled by Mike Nasser/Michael Netzer and inked by Klaus Janson

CHALLENGERS OF THE UNKNOWN #81 penciled by Mike Nasser/Michael Netzer and inked by Neal Adams

PLANET OF VAMPIRES #1 penciled by Pat Broderick and inked by Neal Adams