What are your budget-friendly costume ideas?

If necessity is the mother of invention, then a sour economy is the mother of creative Halloween costumes. Am I right, or am I right? It's t-minus 26 days until Fright Night and not a day too early to start thinking about how you're planning to dress up, fake out, and disguise yourself and your crew this year. Store-bought costumes can be so pricey, especially if you're outfitting an entire family. So, I'd love to know: What are your best budget-friendly costume ideas for Halloween? Share your thoughts in the comments and you'll be entered to win a $15 gift certificate to spend at Mrs. Fields Gifts! (How's that for budget-friendly?) (One entry per person, please. Comments must be received before midnight, Friday, October 9th. Winner(s) will be selected randomly.)