Act as a set designer who decorates on a shoestring. Help me decorate {{venue}} for Halloween with a budget of {{budget}}. The look I want: {{party_theme}}. I already have: {{items_on_hand}}. Give me: 1. The three changes with the most atmosphere per dollar, starting with light: bulb colors, candles and shadows 2. 10 DIY decorations from cardboard, paper, fabric scraps and dollar-store finds, each with cost, time and difficulty 3. Where to put things: the first thing guests or trick-or-treaters see, a photo spot and one surprise 4. A shopping list with rough prices that comes in under my budget 5. What to buy once and reuse every year, and how to store it Safety: LED candles near anything that can burn, taped-down cords, and a clear, well-lit path to the door. Keep anything visible from the street friendly enough for small kids.