NightMode is public domain software.  Do with it what you
like at your own risk.

NightMode toggles the color scheme between the default one
and a white on black scheme that might be nicer for using at
night.  For astronomers, I include NightModeAstro which uses
red on black instead (and also turns off Treo keyboard lights).

If you want, you can customize NightMode/NightModeAstro's color
scheme. To do this, use the free Khroma theme editor when
NightMode/NightModeAstro is running, and save the theme under the name
"NightMode" or "NightModeAstro", respectively.