Opera 6 for Mac supports the Opera for Windows skins and toolbars (). You can change the button set by replacing the folder with the new button set. You can change the image in the background of Opera by replacing the file "foreground.png" in the skin folder.
In Opera 5 for Mac, you can modify your button setup so that buttons appear in the toolbars exactly as you specify. Directions are spelled out in the Howto.txt file located in the folder.
Need help? Hit F1 anytime while using Opera to access our online help files, or go here.