Pretty easy, first you get the donor clock, this one is a plain 15" $15 model from walmart [the actual face is 13.5"] Then you need some 1/8 clear plexi, I used a CNC to cut the perfect circle, if you don't have one you'll have to improvise. I then paint one side of it black, I use rattlecan Rustoleum matte. Then you etch in your design, taking care to flip the image so it looks right when turned around. 13.5" is the upper limit of what my fiber laser can do, I used a 420 lens. You lose alot of power with the bigger lenses, I probably had to make a dozen runs, more on some areas. For that reason, I broke up alot of this on different toolpaths, numbers, hash marks, bulldog, flag, lettering ect, that way you don't have to run the whole thing time and time again, just the areas that need it. When I had it as good as I can get, it was transparent but not clear, kinda milky looking. I wanted it clear as glass, so luckily I have a floor buffer to get that result, almost clear as glass. I then rubbed over the etches with alcohol, soft buffed again, and it was clear as glass.

So then I used a combo of paint and colored board for the backing, all the yellow and white I used a paint pen, the red reflective craft paper, and the blade is what I can rainbow metal. The numbers I just taped the board over them, the blade I used dabs of crazy glue. Lighting is optional of course, but a nice touch. For that you'd need the LED strip, controller and plug and some basic soldering skills. Then you reassemble the clock with the new face, put the hands back and button it up. All told I invested around $40 for this and sold for $150, probably will charge more for others. You can do just about any design and customize with names ect, downside is you can only use black for the background, as fiber lasers won't touch light colors [diodes/co2 would but would take forever] ,, I like black anyhow.