One way to keep the costs of Christmas down is to decorate with things you already have. For example, I bought this hurricane vase at Deseret Industries in Calimesa for $1.50. To make it festive for the Christmas season I added split peas to the base (I had a bag or two on hand), then I put a candle on top and added a sprig of faux berries. Super easy, super versatile for when the seasons change, and super cheap!
Here are some links to some other inspiring ideas on frugal Christmas decor here and here from the Thrifty Home blog.