Horsley's illustration credits in 4th edition Dungeons & Dragons products include: File:Divine Power front cover.jpg|Divine Power (July 2009), front cover File:Martial Power 2 front cover.jpg|Martial Power 2 (February 2010), front cover File:Heroes of the Fallen Lands front cover.jpg|Heroes of the Fallen Lands (September 2010), front cover File:Neverwinter Campaign Setting front cover.jpg|Neverwinter Campaign Setting (August 2011), front cover File:You Take The High Road... by Ralph Horsley.jpg|Dragon #422, cover and page 9