Just uploaded version 0.6.0 which adds an option to display values as gray code.
Though, be aware that this looks best for displays which do the "complete cycle" from 0 to (2 to the power of n) - 1 (n being the number of digits).
Hence, this looks best for the two Unix Time displays.

For the other displays which display the local time there are "jumps" visible in which more than one LED changes.
E.g.: the seconds and minute displays perform such a "jump" when changing from 59 to 0.