If you're get married near the holidays, you’ll likely be able to take advantage of some free decorations from your venue. When viewing potential venues, be sure to ask about how (and when) they decorate for the holidays.
Hit up your local dollar store for basic pillar candles, which come together to create a beautiful, romantic backdrop when displayed on modern shelves.
Book lovers, show off your literary love with an arch made entirely of books. Repurpose tales from your own bookshelves, and hit up used book sales to fill the gaps.