I made a 20" diameter one completely out of boards taken from old pallets. The boards were glued together and then cut in a circle using a router. This gives the best clean cut circle you could have.
I painted the circle white and then painted on the roman numerals as well as a "clock name" and date.
There are no hands or working mechanisms, although that could be added. I think it would look nice as an end table, so I might make some legs for it, or make another clock to be turned into a table.
I am adding this section because of questions (below) in the comments section:
I prefer to make my own jigs like this one that attaches to the router and makes a circle. There are fancier and more precise router circle jigs that you can buy or make but this one works well and is quick and easy to make. I used a scrap piece of 1/4" thick hardboard. You want something solid that will not break or bend and will be the width of your router base and longer than the length of the diameter of the circle you want to make.
***(Please do all the following with your router unplugged)***
Your router will have four screws on the bottom holding on a baseplate which is probably black hard plastic in a circular shape. Take the screws out and remove the baseplate. Put the baseplate on your piece of hardboard and draw around it and the center hole as well as carefully draw the screw holes in the exact positions. Add a long rectangle to the circle shape as shown below (this is all one piece because it needs to be strong). Cut out using a jigsaw. (Mine does not cover the whole base of the router... that is only because it was a scrap piece and wasn't big enough.)
Attach a screw from the top side of the jig where you have made the hole into the center of the circle you are making. If you do not want to have a hole in the middle of your circle, do this on the underneath side. Clamp your wood to the edge of a worktable so that the circle you cut will be off the edge of the table OR clamp it to scrap wood on top of the table. The wood must be firm so that it cannot move while you are routering the circle. Obviously you don't want to cut through a tabletop. This photo shows the router after the circle was cut, I did not cut it there on the table, I cut it at the overhang and rotated it to make the next part of the cut. Lower your bit to cut through the wood or do in two stages. While routing very carefully rotate the router around in a circle, moving your clamp where necessary and making sure the screw has stayed firmly in position.
That was harder to explain than I thought, I hope it's understandable!
(More about my signs in a future post)
Linking to Funky Junk Interiors
The Twice Remembered Cottage
Blue Cricket Design
Making the World Cuter
Sumo's Sweet Stuff
The Shabby Chic Cottage
Faded Charm White Wednesday
and Cottage Instincts
Everything I make is for sale, so if you see something you like, please contact me.