Buy several playing card pkgs at the dollar store and create a wedding banner! 25 DIY Valentine's Day Decorations cute for photography backdrop ! (Banner with cards but for game night party) Or maybe an Alice in wonderland party!
Christmas wrapping idea: Buy brown wrapping paper (cheap to buy at Walmart or a craft store) and use that paper to wrap your gifts. It's useful for every gift, and you can customize it by writing on the paper.