Frost crystals come in varying sizes and shapes depending depending mainly on the time and water vapour available. Snowflakes on the other hand, come in very beautiful shapes and exhibit a 6-fold radial symetry. Although statistically possible, it is very unlikely for any two snowflakes to be exactly alike. It is often used as a traditional image to represent White Christmas.
To get you in the mood, Microsoft has released a beautiful 8-wallpaper theme pack for Windows 7.
Add the delicate symmetry of snowflakes and the ice-blue tracery of frost to your desktop. Download this free Windows 7 theme, and allow these exquisite snowflake and frost images to lead you into the chilly beauty of winter.
You can download this exquisite Snowflakes and Frost theme theme for Windows 7 from Microsoft.
If you want to simply use the wallpapers, you will find them in this folder:
C:\Users\Usename\AppData\Local\Microsoft\Windows\Themes\Snowflake\DesktopBackground
Enjoy the wallpapers! I simply loved them!
You might also want to check out these Beautiful Windows 7 Christmas Themes.