I have noticed (no names) a number of analog clock faces with a variety of interpretations of a 24hr clock face.
Reference design(s): (only focused on rotation, tick marks, and not layout or graphics)
Tick marks used are available: http://community.facer.io/c/watchface-Resources/tick-marks
Alternative design: (was my initial attempt, but needed time to complete))
Update: Added 'fine' marks, for outer minutes.