It totally looks like blown glass to me. Don't you think?
I used a striping brush and splotched each polish around. You could probably do it with the bottle brushes, but you might have a bit of clean up. With a small brush I was able to shape the polish around my cuticles and didn't need to do any clean up. This was done with all jellies. I need more jellies so I can do this again. I might try this over white next time to bring the color out more. I used NYX Ink, China Glaze Phat Santa, Milani Rad Purple and Ulta The Jungle Look. I want a yellow and orange jelly. And maybe a brown. Are there black jellies?