The holiday season also brings a certain frame of mind, why not jump on board with a redesign to suite that holiday.
Add a santa hat to your logo or cover your header design in snow. These touches show your site is current and that you really understand what the season is about, being merry.
Customers can relate more with a site that is prepared to show that it's current and involved.
This should also flow to in to your marketing. Change your add banners or text to reflect the season. You can even change the design of your marketing landing pages within your site. Don't forget to include any special offers on your landing pages to invite visitors to browse your site once they arrive.