Additional schemes and error
Option 1.
The script "holiday_bell.js" in any folder using the path "holiday_bells". Code in extra.css uses holiday_bells2 or holiday_bells3 or holiday_bells4.
If you want to use additional schemes, copied to the root - folder "holiday_bells" and the desired scheme (holiday_bells2 or holiday_bells3 or holiday_bells4).
Option 2.
Use one folder and name it "holiday_bells", but replace all values in extra.css "holiday_bells2", "holiday_bells3", "holiday_bells4" on "holiday_bells"