I had the green tree fabric in my Christmas stash, and backed them with left over red fleece from Anna's apple costume.
I found this giant Christmas scarf at Goodwill and backed it with some fusible fleece to make it sturdy. That took forever! I had some golden fabric in my Christmas box too, so no expense there.
But as I was feeling all self-congratulatory for using a 99 cent scarf to make my giant pillow cover, it occurred to me that I ought to also include the $7 for fusible fleece, and then it occurred to me that making Christmas Pillow Shams in the first place is not really all that thrifty, but it was fun, and they make me happy every day. So there.