theme, motive, leitmotif, leitmotiv, idée fixe, leading motive, idea, subject, thema, argument, more...

variation, deviation, anomaly, randomness, divergence

floral, geometric, animal, abstract, tribal, botanical, ethnic, art deco, more...

central, same, common, dominant, decorative, binding, recurrent, main, recurring, important, basic

recurring theme,   common theme,   recurring melody,   design detail,   overarching theme,   recurrent theme,   relief ornament,   batik design,   ornamental design,   repetitive pattern