Use real foliage like mums, pumpkins, and branches to keep costs low and avoid plastic overload. Battery-operated LED lights are inexpensive and reusable, creating warm ambiance without extra wiring. DIY props like foam stones for graveyards or paper jack-o'-lanterns add charm with minimal spend. Grouping decorations in odd numbers and repeating materials at least three times makes a small space look intentional and stylish without overspending.