Here are just a few ideas you might try:
1) CoinStar–Gather up all your loose change and take it to the nearest CoinStar machine to be converted into gift cards or cash. If you can come up with $40 worth in change, you can get an additional $10 bonus. Read more here.
2) Cash4Books–Look around your home and find used books you no longer need or use and sell them to Cash4Books. They pay promptly through Paypal so you can quickly have your money in hand after shipping off the books.
4) Etsy–If you're skilled in the area of arts and crafts, consider setting up a simple shop on Etsy and selling some of your handmade goods. Read this article here for ideas on getting started.
5) YouData–You won't make a lot of money off of this, but if you have some extra time to view some commercials online, you can earn a few dollars each week through YouData. Best of all, they pay via Paypal at the end of every week so it's a very quick turnaround. More details on this are here.
Those are just a few simple ideas I had for quick ways to generate some cash. I'd love to hear ideas from the rest of you–especially if it's something you are personally doing this year to help shore up your Christmas budget.