Sometimes it is said that the Green Oak kit resembles traffic lights. NO!
In fact it is written that the colours of the kit embody cabalistic principles.
Now it is Oaken's pleasure to impart such knowledge as may be safely disclosed...

The Green Oak colours are in fact:

Russet
Citrine
Olive
Black

These are the colours ascribed to the earth sphere Malkuth in the Qabalah.

Well - you did click.....!