I decided to make some humorous ones. An Indian 1940 stamp from the American Motorcycles series (Scott #4085) sits surrounded by flames. A Liberty Torch booklet single (Scott #2531A) is positioned as if its flame has set the fire. A pictorial postmark featuring a motorcycle rider in frames, drawn by artist David Smith, cancels both stamps and speeds away from the inferno.
In the lower-right is a yellow warning label with very good advice: "Avoid setting motorcycle on fire"