There aren't much theme development going on for Ubuntu 16.10 Yakkety but there are still people who are doing their jobs behind the scene for you to make your desktop as fancy as possible. Since in Ubuntu 16.10 changed a lot and it takes a lot of time to rewrite the theme from scratch. Dark Aurora theme isn't dark but it looks great and it is available for Gnome Shell, Unity, Cinnamon, Xfce and compatible also with other desktops. Dark Aurora theme is kind of grayish color theme and it's easy on eyes as developer mentioned on the theme page. There are four variants in this theme and we've added all versions to PPA and supports GTK 3.12/3.14/3.16/3.20/3.22 available for Ubuntu 17.04/16.10/16.04/14.04/Linux Mint 18/17 and Gnome Shell theme versions 3.14/3.16/3.20/3.22/3.24 available. If you encounter any issues with the latest version of the theme 3.20/3.22 then report it to developer and hopefully it will get fixed in the next update If you are using other distribution you can directly download theme from its page and install it manually. You can use Unity Tweak Tool, Gnome-tweak-tool to change themes/icons.
