To reuse materials for sustainable Halloween decorations, repurpose household items like glass jars, plastic milk jugs, and fabric sheets year after year. Clean and store paper bat cutouts and wreaths properly to avoid damage. Transform old sheets into ghost figures or table covers. Repaint or redecorate jars to update their look, or switch out candle types inside lantern clusters to keep things fresh. Branch wreaths can be refreshed by adding new paper or small hanging ornaments. Using these methods reduces waste and saves money by avoiding one-time purchases. Sustainability and style combine when you plan for reuse in your Halloween decor, creating memorable scenes with minimal environmental impact.