Here's an obscure one that even I had never seen until TMNT fan Adam Winters shared it with me yesterday. It can only be found in the 2nd printing of TMNT (Vol. 1) #7 published January, 1989. The piece is by a duo I can only identify as "Hatten and Balcziunas".
And it is Donatello having a showdown with Wolverine (or a legally acceptable vague likeness).
Peter Laird's opening editorial for the 2nd printing doesn't even mention the new pin-up (hence why I don't know the first names of the artists), so it's pretty easy to miss. They did a good job capturing Kevin Eastman's style on Don, though.
