If youre one of the diminishing number of people who still receive DVDs in the mail from Netflix, you may have noticed a little more holiday cheer with your movie in the last week or so. Last week, Netflix started sending out DVDs to subscribers in holiday-themed envelopes, decorated with snowmen, a wrapped gift, a candy cane and, of course, Santa Claus himself. Envelopes with penguins and an igloo adorned with Christmas lights will run during the week of Christmas. …