He has also produced artwork for other games including Extreme Vengeance (Archangel Entertainment), Sovereign Stone (Sovereign Press, Inc), and Hollow Earth Expedition (Exile Studios), and illustrated cards for the Magic: The Gathering collectible card game.
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Perrin and Lester Smith designed the Sovereign Stone RPG (1998) based on the trilogy of Sovereign Stone books, and Margaret Weis formed the company Sovereign Press with herself as CEO to publish the RPG.
Since the founding of the Council, Trampas has worked with Sovereign Press/Margaret Weis Productions as a designer on the Dragonlance sourcebooks for 3rd edition, including Holy Orders of the Stars, Knightly Orders of Ansalon, and Races of Ansalon.