Here's an early example of when M&M's started to jazz up their candy selections and tie them in with various themes and holidays. As you can see, this is a fairly humble beginning, but still nicely done.
These bags had produced a quandary for me because there wasn't any evident way to open them without tearing the ends. It was soon after that I evolved my technique into using an Exacto-blade to slice them open down the back. But the opened ends also create a nice effect... they're like Christmas gifts that have joyfully been opened!