Basically I too fall in that 'customizing-freak' category to customize certain features of the OS apart from the specific applications we work on.
One among them is, to have the preferred font, foreground and background colors in the Comman Prompt and with a shortcut to the command prompt on the Quick Launch bar.
Just today when i was searching for a help command for another utility (services.msc), got to know about this favorite-and-regular routine of mine.
Windows has a command utility named Color with an argument to set the foreground and background colors for the window being opened.
I bet no one can beat the Microsoft's help/documentation. so for your info, just copy-pasting the information available in the help!
Command : color help
Sets the default console foreground and background colors.
attr Specifies color attribute of console output
Color attributes are specified by TWO hex digits -- the first
corresponds to the background; the second the foreground. Each digit
can be any of the following values:
0 = Black 8 = Gray
1 = Blue 9 = Light Blue
2 = Green A = Light Green
3 = Aqua B = Light Aqua
4 = Red C = Light Red
5 = Purple D = Light Purple
6 = Yellow E = Light Yellow
7 = White F = Bright White
If no argument is given, this command restores the color to what it was
when CMD.EXE started. This value either comes from the current console
window, the /T command line switch or from the DefaultColor registry
The COLOR command sets ERRORLEVEL to 1 if an attempt is made to execute
the COLOR command with a foreground and background color that are the
Example: "COLOR fc" produces light red on bright white.
My preference goes as : "Color 0a" :P
Note: It just sets the colour for the current window being opened! :)
Another Info about the 'DefaultColor' registry value: it is present in the HKEY_USERS/.DEFAULT/Software/Microsoft/CommandProcessor directory in 'regedit' (Registry Editor).