Here's one that I made for my sister to help her learn how to tell time. Originally I thought about just having hands that you could move manually but the more I looked at how to accomplish that I realized that I could just bolt on a AA driven movement for about $4 and be done with it, and also wind up with a fully functional clock in the process. I drew the circle and created a line from the center to the circle at the 12 o'clock position. Then copied the line around the circle 60 times. Then drew two smaller circles (one for the 5 minutes ticks and one for the minutes ticks. With all this drawn I began to selectively erase all the extra lines and then the two smaller circles leaving what was carved. I know there are better and probably easier ways to do this but this wasn't that hard and what came into my mind while drawing it.
(Cut in DuPont Corian with 90 degree bit, engraving filled with acrylic paint then polished off of surface)
PS Movement was from one of my "famous" China suppliers for about $1.99 and about $1.50 shipping. I couldn't have made a set of hands for that. BTW, doesn't come with battery for that price
ha ha ha