Muse

"I am waiting for the muse to move me."

"You know, I could grow old and die, waiting for you to finish this, or at least make a start.".

His eyes brightened, "Thanks Tony, that was it!"

"What was?"

Paint quickly flowed onto the canvas. "voila!"

"Oh, ha ha, Mark, very funny."

"I thought it was." Turning the painting to the light one could see a man that had been killed with a paintbrush.