Change the colors using the SetColors Maplet application.
A new palette can be selected by name, replacing all colors
Or a sequence of colors can be give. Here replace just the first three colors:
Display a plot with the new set of default colors.
A new palette can be selected by name, replacing all colors
A list of colors will replace the whole list of current colors
If a list of few colors is given, they will be repeated so there are at least ten