No reason for this not to point to the file already in the ORS folder
Some color options for overlays

The resource designer can specify low and high color values for any
resource overlays to use, similar to how Kethane resource nodes work.

The config node values should be in 0-1 RGB floats:

lowColor = 0.1, 0.3, 0.4
highColor = 0.8, 0.7, 0.9