Customize menu > Customize User Interface > Colors tab
The Colors panel of the Customize User Interface dialog allows you to customize the look of the software interface. You can adjust the colors for almost every element in the interface, giving you the freedom to design your own unique style.
The quad menu colors cannot be customized from the Color panel. To customize quad menu colors, use the Advanced Quad Menu Options dialog.
To change an interface element color:
From the Elements drop-down list, choose the category of the interface element whose color you intend to change.
In the list below the Elements field, highlight the element whose color you intend to change.
Click the Color swatch and then use the Color Selector dialog to choose a new color. Click the Close button to set the color.
To restore the color that was active at the time that you opened the dialog, highlight the element and click Reset.
Continue choosing elements and changing colors as necessary.
To finish and apply the color changes to the interface, close the dialog by clicking the X button in the upper-right corner.
Tip: If you change several colors and then want to restore all colors to the default values, click the Load button and open DefaultUI.clr.

Elements—Displays a drop-down list that lets you select from the following high-level groupings: Geometry, Gizmos, Grids, HSDS Controls, Manipulators, Material Editor, Objects, Rollouts, Schematic View, Track View, Track bar, Unwrap Colors, UVW Map, Vertex Paint and Viewports.
[UI elements list]—Displays a list of the available elements in the active category.
Color—Displays the color for the selected category and element. Click to display the Color Selector, where you can change the color. After choosing a new color, click Apply Colors Now to make the change in the interface.
Reset—Resets the color of the highlighted element to the value that was active when you opened the dialog.
Intensity—Sets a grayscale value for the display of the grid lines. 0 is black and 255 is white.
This control is available only when you choose the Set By Intensity option from the Grids element. This affects the intensity of the grid lines in the viewports.
Invert—Inverts the grayscale value for the display of grid lines. Dark gray becomes light gray and vice versa.
This control is available only when you choose the Set By Intensity option from the Grids element.
Scheme—Allows you to choose whether the main UI colors are set to the default Windows colors or whether they can be customized. If Use Standard Windows Colors is active, all of the elements in the UI Appearance list are disabled, and you are unable to customize the UI colors.
[UI appearance list]—Displays all the elements in the user interface that can be changed.
Color—Displays the color for the selected UI appearance item. Click to display the Color Selector dialog, where you can change the color. After choosing a new color, click Apply to make the change in the interface.
Reset—Restores the highlighted UI appearance item to its color when you first opened the dialog.
Saturation—Sets a saturation scale of enabled or disabled icons in the UI. The higher the saturation, the less gray the color. See Red, Green, Blue / Hue, Saturation, Value.
This control is only available when Icons: Enabled or Icons: Disabled is highlighted in the UI Appearance list.
Value—Sets the value scale of enabled or disabled icons in the UI. The higher the value, the brighter the color. See Red, Green, Blue / Hue, Saturation, Value.
This control is available only when Icons: Enabled or Icons: Disabled is highlighted in the UI Appearance list.
Transparency—Sets the transparency value scale of enabled or disabled icons in the UI. The higher the value, the more opaque the icon will be.
This control is only available when Icons: Enabled or Icons: Disabled is highlighted in the UI Appearance list.
Invert—Inverts the RGB value for the display of enabled or disabled icons in the UI.
This control is only available when Icons: Enabled or Icons: Disabled is highlighted in the UI Appearance list.
Apply Colors Now—Makes any change you have entered using this dialog active in the user interface.
Load—Displays the Load Color File dialog. Allows you to load custom color files into your scene.
Save—Displays the Save Color File As dialog. Allows you to save any changes you’ve made to the user interface colors to a CLR file.
Reset—Restores any changes you’ve made to the colors to the default setup (defaultui.clr).