Hmph. Place an image control directly over the command button. Then use the LoadPicture command to load whatever the user wants to the image. I clarify:

***********************
* _______ .
*| | .
*| Image | Button .
*|_______| .
* .
.......................

My kingdom of a @#$%-ing image tag...

Anyway, use a right-click -> Bring To Front to get the image in front of the button. Just make sure your text doesn't land under the picture.