**These two guys **as buddies, doing buddy-stuff:
These two, together:
Marx and Lennon (Lenin)
Thanks for all your contributions. There are some really fantastic ones and it’s going to keep me busy photoshopping over the weekend. 
German mathematician Leonhard Euler, wearing an Edmonton Oilers NHL jersey. Euler is pronounced “oiler”. You can recreate the Oilers logo, with the spelling “Euler”.)
We’re in the computer science department of a German university, so recognizing Euler and pronouncing his name is no problem for us. What will be harder is getting anyone here to recognize Canadian hockey jerseys (or American baseball players, as someone else proposed above). 
That’s part of the fun. Use the photo showing “COLANGELO” and see who will be the first to make the connection.
Will they understand that the Matchbox pun is an allusion to A Clockwork Orange? :dubious: (The line is ideally delivered with a British accent.)
I’m afraid that might be too obscure as well—even the Schwarzenegger “I’ll be Bach” one might be problematic. Most films here are dubbed, so many of the pop-culture catchphrases we anglophones take for granted might be completely unfamiliar (at least in their original forms) to many of my colleagues.
So how about a piglet with photoshopped hands making a diamond shape, and a page cut? (Angela Ferkel, Ferkel being piglet in German.)
Or swap Sigmar Gabriel’s head with the eighteenth letter of the Greek alphabet, yielding Sigma Gabriel…
As for poets, how about combining the author of The Raven with the red teletubby, creating that dreadful chimera Edgar Allan Po? (Something like this.)
Or, since you’re in computer science, how about making Al Gore dance according to a fixed sequence of steps? Yes, that’s right, it’s an Al Gore-rhythm…
Take a picture of Friedrich II. (or, hell, any of those other Friedrichs), and paint it in glittery colours—Friedrich Schiller(t), ‘schillern’ meaning something like ‘dazzling’ when it comes to colours.
Have German comedian Otto Waalkes jump off a slice of pickled herring—Otto von Bismarckhering.
The forearm of an African kid = Schwarzschild radius?
I’m guessing a Clawed Pussy would not go over well.
I’ve improved it* by adding two more that probably don’t deserve their own:
An African kid standing on a plank (Planck), throwing one stone.
*Or made it worse depending on your opinion of puns.
You can’t do this one visually, but I’m posting it anyway.
I heard a Classical Music FM station do a one-hour program* about violinist Isaac Stern.
The title was: “No Tone Unsterned”
Made me giggle. YMMV.
(* Karl Haas, Adventures in Good Music, c1975)
The second component in “Schwarzschild” is “Schild” (= shield), not “child”. Maybe you knew this, but I think a macaronic pun involving the English pronunciation of an arbitrary part of a German word is probably a tad too difficult.
By the way, I just found that some has already mocked up an Edmonton Eulers logo. I think this is brilliant.