When I designed my daughter’s craft desk, I added three holes to accept cups for holding crayons, pencils, and things. I thought that they would make a great way to accept different interchangeable modules as well – a marker module, a painting module, etc.

As one of her Christmas presents, I made this marker holder. I turned a chunk of maple to fit perfectly into the recess, leaving a lip on it to that it doesn’t fall through the hole. Before turning the dome shape, I evenly spaced holes to accept the markers. Then I could mount it on the lathe and turn the top into a gentle dome before sanding, finishing.

Update 2017-04-24: While does look nice, with so little clearance between markers, it’s difficult for an adult to use, let alone a child. The markers are just too securely lodged in the caps.