It’s really difficult to install the themes. I tried software center, paper themes are available but nothing happens after installation. I followed the instruction as mentioned in this thread: Update Theme ClearLinux download the themes from github and compile etc. But got only themes in appearance but no paper themes in cursor. Those appearance themes also dark or light only. While trying those themes I think there was a bar in the top right of window before min max icons, now gone for ever. Also I had to install dev-util package, which is not removable now, saying two packages are using it.
I am really missing those blue color icons and windows. There should be an easy option to install themes.