The CD 200 style is my favorite. Unfortunately not too many insulator manufacturers made these, so there really aren't too many different ones out there to collect. However! During the late 1910s or so Brookfield produced small lots of these with varying degrees of amber swirling in dark aqua glass. No two of these look alike! So that's how I get some of my thrills as I enjoy continually looking at the ones I have and staying on the lookout for more! The one shown is about as swirled as I have seen. I am including another view (click "Next").

This example came from an eBay auction win. The vast majority of swirled CD 200's have originated in Canada, like lots of plain aqua ones and Stars, too.