This folder is at:
~/Library/Application Support/Tinderbox/color schemes
This folder is used to hold custom colour scheme (TBC) files that are then available for use in any Tinderbox file via the Document Settings' Colors tab. The name of the colour scheme will be the name of the TBC file.
If a TBC is added while a document is open, it is necessary to re-open the app in order that the Document Settings' Colors tab lists the new scheme.
To make it easier for the general Mac user to access Tinderbox's support folders, the Help menu's 'Reveal Support Folder in Finder' option will open the folder in a new finder window.