Here’s something different (for me, at least): a single-sided QSL card.
Even if one of my QSLs is meant to be sent as a postcard, I usually design them two sided: color on the front, black and white on the back. I like working with a big canvas.
Matt, N9YBK, however, was on a tight budget. He’s a former cop who works as an IT professional, freelances as a photojournalist and has eight kids. I get that. Contrary to popular perception, we cartoonists have to watch our pennies, too. I did my QSLs on the cheap for years.
My solution to Matt’s budget dilemma was to forego color and consolidate both his cartoon and the report form on one side of the card. The cartoon combines two aspects of Matt: his trusty camera; and his dream police cruiser, a Dodge Charger. Matt liked his card. So did I.
Robert, WA2GO, is a dentist who wanted to incorporate his profession into his QSL. Fortunately, he also has a sense of humor about it. He gave me free rein to come up with something, and my first thought, I hate to say, was 
This was the query from John, N1ESE: “I like goats and the woods. My shack is off-grid and runs on solar power. That’s about all I have. Let’s talk.”
Hams like to work local landmarks into their QSL cards and club logos. It’s not every day the landmark in question is the world’s largest steel moose.
Before this metal moose was erected, the biggest moose sculpture in the world was 32-foot-tall 
This is not the short story by Stephen King; rather, it’s just one serious ham with a serious lawn mower. The squirrel is safe.
Some QSLs just kind of draw themselves.
My solution was to delete the background for the printed version, easy to do with Adobe Photoshop. That way, Tim still had an attractive piece of art to hang on the wall of his shack, yet the QSL stayed clean and simple. Sometimes, less is more.
Who’d have thought to combine amateur radio with ballroom dancing, of all things? Ron, N4VZ, did. He and his wife, Kate, K4VZT, are both hams, and Ron wanted a his-and-hers QSL that spotlighted another hobby, ballroom dancing.
To make the card usable by either Ron or Kate, I modified one of my standard report forms as shown here, adding check boxes as shown here.
Here’s another illustration that was commissioned but didn’t see print for one reason or another. It’s a shame, too — I put a lot of work into it and was looking forward to sharing it with the world. A detail of the illustration headlines the post; the full illustration is below.
Sometimes the solution is obvious. DXpedition? From an island? With a pelican? And a hex beam? Coming right up!
Scott, W5PLT, pilots ships professionally between New Orleans and the Gulf of Mexico. He says he’s “kind of a modern-day Mark Twain.” That led me to believe I ought to play this QSL for laughs.