The best budget-friendly DIY Halloween decor projects for 2025 include creating paper bat swarms, jar lantern clusters, branch wreaths, ghost sheet figures, and milk jug pumpkin runway lights. These projects require inexpensive materials like cardstock, glass jars, tree branches, old sheets, and empty plastic jugs. Each offers high impact through repetition, layering, and moody lighting while remaining renter-friendly and reusable. For instance, arranging paper bats diagonally near lighting fixtures intensifies shadows and motion. Jar lanterns provide warm interior or porch ambiance. Milk jug pumpkins illuminate driveway edges creatively and safely. These projects are quick to assemble, avoid waste, and enable stylish, eerie home transformation without spending much.