Get creative and make them yourself, using old bedsheets, curtains, vintage lace, linen, hemp or recycled paper. They are especially nice as a banner behind the head table with "congratulations" or "mr & mrs newlywed" embroidered on them, or on the dessert table as well. They are also showing up in some very stylized wedding photo shoots, which I am loving. Bunting can also be used in mini form as a super cute cake topper to tie in the theme.
You can also buy vintage bunting straight from etsy.com in all kinds of different styles and fabrics, like this cute vintage fabric bunting:
Side note: bunting necklace? oh my yes. stick one of these on your flower girl right now!