Juniper Allegro CE Owner's Manual page 89

Use the Appearance tab to change the color scheme of the display
contents (the default is High Contrast White). Windows Standard
and High Contrast Black are also recommended.
Options such as Eggplant appear as various shades of gray. As you
make an appearance selection, the change is shown on the left side of
the screen, allowing you to view it before you apply your selection.
Customize the display by clicking on an element shown on the left,
Window Text for example, or selecting it from the pull down list
shown in the upper right. Tap on the Color button below the Item box
and a palette with available shades of gray appears.
Windows CE Page 4-29