Took a few different methods to accomplish the aesthetic I was looking for and slightly more time consuming than I had hoped.
Essentially, I'm manually placing some top layer traces to custom sized pads I created for the project to limit the light that will come through the pad holes aka "stars". Then I'm using the tstop layer to pull back the soldermask.
One of my favorite constellations, Orion. Now like a million to go....
Got a bitmap of my NASA constellation image that isn't pretty but usable. It was a struggle as usual importing any kind of image into Eagle CAD. Now I have a reference and the next step is figuring out how I'm going to "artfully" do the layout.
Pretty huh ;) It looks worse than it is...it's actually about 8" in diameter.