This one is easy.
In 1996, Gene Colan advertised in the back of the CBG that he would do commissions for $250. I sent him and Adrienne a copy of an old magic poster that I liked and hoped to one day use as the cover of a novel, if I ever finished writing it. I told him to put Howard the Duck in the place of the magician who was on the poster. Not only was it perfect (the expression on the Devil's face is so different than on the poster, and yet excellent in context), it started a decade-long series of commisions and a friendship that I very much miss. I had Steve Leialoha ink it a couple of years later, and Steve captured what was special about Gene's pencils.