I included 3 different sizes of earring that can easily be adjusted. I use the preset engrave setting for the center design and preset cut for the outer circle. The scoring needs to be deep enough that when you go to use paint pens they will stop the pain from bleeding over the edges. 

I used some scrap wood since these are so small, using the framing feature. 

I used the acrylic paint pens for this since they are much easier to use for accuracy. After they had dried I glued the earring post to the back with super glue being sure not to put too much on where it overflows a lot out of the sides.

I then popped the earrings into a piece of cardboard so they could be spray painted. After I sprayed with the clear coat I pop them up so they did not dry to the cardboard.

You can use metal or rubber backs. I personally like the rubber ones as it is more comfortable and snug. Enjoy!