3D Buttons is a control panel that substitutes custom 3D buttons for standard push buttons, radio buttons and checkboxes. On color displays, the buttons have a subtle 3D look. On black & white displays, the buttons are identical to standard Macintosh buttons. The push button has the same oval shape as a standard button and works correctly with default button outlining. Check boxes use a "real" check mark rather than an "X" and radio buttons have a "domed" look. On a non-white background, check boxes and radio buttons are drawn with embossed titles.
See also: Kaleidoscope which does all of this and way more appearence tweaking.
Compatibility3D Buttons is a control panel. To install it, simply drop it on your System Folder and restart.