Click the Style Manager Color control.
Select a palette in the Color dialog box.
Double-click a color button to open the Modify Color dialog box, or click a color button and then click Modify.
Click Grab Color to display the grab pointer.
Move the pointer to an area of color on the screen that you want to grab.
Click to make that color the new color.
This causes the desktop to use one more color so applications have one fewer color available to them.