The sequence of code used in the opening credits of The Matrix has spawned so many wallpapers, backgrounds and themes that I've lost count.
This Matrix Theme for Pocket PC is one of the better ones. It adds a background wallpaper consisting of column after column of miniature green code reels against a black background. The color scheme works very well, and the neon green text used on the Today screen menu shows up really clearly.
Besides these changes, the Matrix Theme also modifies the Start menu, toolbars, adding a cool touch of green to everything.
It's a shame the background wallpaper, but overall, the Matrix Theme is the ideal customization for fans of the movie.