make up — the style or manner in which something is made; form; build.
play by ear — a dramatic composition or piece; drama.
toss off — to throw, pitch, or fling, especially to throw lightly or carelessly: to toss a piece of paper into the wastebasket.
brainstorm — If you have a brainstorm, you suddenly become unable to think clearly.
concoct — If you concoct an excuse or explanation, you invent one that is not true.
contrive — If you contrive an event or situation, you succeed in making it happen, often by tricking someone.
dream up — a succession of images, thoughts, or emotions passing through the mind during sleep.
throw together — to propel or cast in any way, especially to project or propel from the hand by a sudden forward motion or straightening of the arm and wrist: to throw a ball.
coin — A coin is a small piece of metal which is used as money.
extemporise — (intransitive) To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise.
extemporize — Compose, perform, or produce something such as music or a speech without preparation; improvise.
fake — to lay (a rope) in a coil or series of long loops so as to allow to run freely without fouling or kinking (often followed by down).
jam — to press, squeeze, or wedge tightly between bodies or surfaces, so that motion or extrication is made difficult or impossible: The ship was jammed between two rocks.
spark — Muriel (Sarah) (Camberg) 1918–2006, British novelist and writer, born in Scotland.
dash off — If you dash off to a place, you go there very quickly.