Hi Daniel,

See http://www.word.mvps.org/FAQs/MacrosVBA/CustomButtonFaces.htm

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Regards,
Jay Freedman
Microsoft Word MVP         FAQ: http://word.mvps.org

Daniel,

From the Word Help file:

For a clear image, copy a graphic that is the same size as a built-in button
image or a menu command image. The default built-in button image is 16 x 16
pixels. A larger image might be distorted because it will be scaled to fit
the size of the button.

 1.. Copy to the Office Clipboard the image that you want to appear on the
toolbar button or menu command.
 2.. If you can select the format for the copied graphic, select a bitmap
or picture format.
 3.. Switch to the Microsoft Office or Office family program you want to
paste the image to.
 4.. On the Tools menu, click Customize.
 5.. Make sure the toolbar you want to change is visible.
 How?

   1.. In the Customize dialog box, click the Toolbars tab.
   2.. Select the check box for the toolbar you want to display.
 6.. In the Customize dialog box, click the Commands tab.
 7.. Do one of the following:
   a.. To paste the copied image to a toolbar button, click the button,
click Modify Selection in the Customize dialog box, and then click Paste
Button Image on the shortcut menu.
   b.. To paste the copied image to a menu command, click the menu that
contains the command image you want to change, click the command, click
Modify Selection in the Customize dialog box, and then click Paste Button
Image on the shortcut menu.