Using a solid color for the desktop background reduces the number of colors used by the Oracle Solaris Desktop system.
To set a solid color for the desktop background, type the following commands:
# gconftool-2 --type string \ --set /desktop/gnome/background/picture_options none
# gconftool-2 --type string \ --set /desktop/gnome/background/color_shading_type solid
# gconftool-2 --type string \ --set /desktop/gnome/background/primary_color #hexadecimal-color
Alternatively, you can use the Background preference tool to choose a solid color for the background.