I used to be a huge Kliban fan back in the day. I’ve still got various t-shirts with his art on them.
From memory:
a cat wearing a Japanese headscarf presenting (/selling?) sushi
2 karate cats getting into it; one has the other by the tail
a cat dressed as a sumo wrestler
a cat playing the guitar and singing the blues: “Love to eat them mousies / Mousies what I love to eat / Bite they little heads off / Nibble on they tiny feet”
That last one is one of my all time faves. I would “sing” it to my friends whenever someone commented on my shirt, complete with the standard blues riff.
Another random one (not a t-shirt): 2 cats, one says “Mao”, the other points and says “Mousie dung”. It was a very oblique, random and context-free reference to Mao Zedong. So random, I think the only point of it was to illustrate the pun. If there was a clever political reference, it was lost on me.