Oclock simply displays the current time on an analog display.
  - -fg color
- choose a different color for the both hands and the jewel of the
    clock
- -bg color
- choose a different color for the background.
- -jewel color
- choose a different color for the jewel on the clock.
- -minute color
- choose a different color for the minute hand of the clock.
- -hour color
- choose a different color for the hour hand of the clock.
- -backing { WhenMapped Always NotUseful }
- selects an appropriate level of backing store.
- -geometry geometry
- define the initial window geometry; see X(7).
- -display display
- specify the display to use; see X(7).
- -bd color
- choose a different color for the window border.
- -bw width
- choose a different width for the window border. As the Clock widget
      changes its border around quite a bit, this is most usefully set to
    zero.
- -shape
- causes the clock to use the Shape extension to create an oval window. This
      is the default unless the shapeWindow resource is set to false.
- -noshape
- causes the clock to not reshape itself and ancestors to exactly fit the
      outline of the clock.
- -transparent
- causes the clock to consist only of the jewel, the hands, and the
    border.
If you would like your clock to be viewable in color, include the following in
  the #ifdef COLOR section you read with xrdb:*customization: -color
This will cause oclock to pick up the colors in the app-defaults
    color customization file: /usr/X11R7/lib/X11/app-defaults/Clock-color. Below
    are the default colors:
Clock*Background: grey
  
  Clock*BorderColor: light blue
  
  Clock*hour: yellow
  
  Clock*jewel: yellow
  
  Clock*minute: yellow
X(7), X Toolkit documentation
Keith Packard, MIT X Consortium