Thanks everyone! I love Little Windows - the woman who owns the company is really nice. Super helpful. There are video tutorials
on her website for those looking to learn how.
The glitter paint I used is called Scribbles Dimensional Fabric Paint
I cut out a little circle of transparent plastic (the kind you use in binders as folder separators) and painted on that, let dry overnight, embedded it in (pour half full, slide the painted circle in, push to bottom) and then covered with more resin.
I filed the edge a bit with a fine nail file (use a mask!) and then drilled the hole in the top by hand with a small Dremel drill bit. I've since purchased the hand drill from the Little Windows site to make that easier until I can get a drill press for my rotary tool.
Hope that helps.