Adding custom colour palette in excel

[Stumped]

Is it possible to add the custom colour palette to the cell shading options
in excel 2003 (same as in word)? I would like to extend the range of
available colours without having to go through the options menu each time I
need more than what is available in the standard selection.

 

[FSt1]

hi
excel only allows for 56 different colors. these colors can be modified
through the options but 56 is the maximun number allowed.

regards
FSt1