Here are some of my favorite Christmas screen savers I found on the net.

Windows version
Mac version

Holiday Lights (from Tiger Technologies)

Holiday Lights strings rows of Christmas tree bulbs around the edges of your screen, with festive music playing in the background. It even includes a screen saver with gently falling snow and other seasonal choices to put you in the holiday spirit.

Windows version (2800k)

Christmas Breakout (from CMB Software)

An instant classic! Christmas Screen Saver arcade game featuring holiday music and sound effects and Christmas graphics! It saves your top 10 scores!

Windows version (4000k)

Snowflake Screen Saver (from CMB Software)

This screen saver displays stunning Winter photos while snow falls over each scene. A variety of Christmas music plays in the background during the screen saver.

Check out the cool Christmas games