Updated to work on Linux Mint 20.3 (Una)
Menu, Panel, and Calender only (cinnamon.css).
Does not include Windows Borders or Controls.
To use:
-
Make a copy of a theme found in usr/share/themes. (i used Mint-Y-Dark so that would be a good choice).
-
Go to your home folder and under view on the menu click "show hidden folders" and look for .themes folder.
-
If .themes doesnt exist, create it. Right click >> Create New Folder, >> type .themes
-
Paste the theme you copied into the .themes folder
If you have to create a .themes folder, it should have a period in front of it >> .themes
-
Replace the cinnamon.css in your copy of Mint-Y-Dark with halloween cinnamon.css.
-
Rename Mint-Y-Dark to Halloween (or whatever..)
It should now show up in your themes under: System Settings >> Themes >> Desktop
Enjoy.