I totally agree with you Michael, this is a very fine use for Corian. Very well done Jozua.
When I used it to make the Lady in the Woods carving that you saw at the McGrews Aspire Camp two years ago, I used dark gel stain, then wiped the surface with a little paint thinner on a folded paper towel, lightly wiping the surface until the surface was clean again. You get sharp edges that way, and the original slick finish on the Corian is not harmed at all. It also works with paint, but in both cases it uses a lot of paper towels. The folded paper should be lightly dampened and turned often. With practice you will get a feel for just how damp is best.