Finlay's work is notable for a number of recurring themes: a penchant for classical writers (especially Virgil); a concern with fishing and the sea; an interest in the French Revolution; and a continual revisiting of World War II and the "memento mori" Latin phrase "Et in Arcadia ego". His 1973 screenprint of a tank camouflaged in a leaf pattern, "Arcadia", referring to the Utopian Arcadia of poetry and art (another recurring theme), is described by the Tate as drawing "an ironic parallel between this idea of a natural paradise and the camouflage patterns on a tank".