Mint-Y is based on Arc theme and it has 3 default themes: Mint-Y, Mint-Y-Dark, and Mint-Y-Darker. Below are some screenshot from the default Mint-Y running on Cinnamon Desktop.
The icons are now refreshed with more vibrant colors and also flatten just like what latest iOS and Android did. Number of icons are quite large so you can expect many popular applications will already have it's icon provided so that it will have a consistent icons throughout all apps installed.
As a bonus, i tried to switch to MATE and voila, it was detected as well and it works well on MATE. Here's a screenshot of running Mint-Y-Dark theme. There was a simple glitch on the preview, but it wasn't major issue.
For now, these two packages are only provided in master branch of my CSB project and i would like your opinion and feedback about it. If many users enjoyed this new theme and icon theme, i may add it into 14.2 branch and provide a new binary package for it.