If a rule entitled “Color (or colour if you swing that way)” exists then add a new rule entitled “Bah Bah Black Sheep” with the following text:

If a rule indicates that some action causes a sheep to become a black sheep, it means that any sheep may subsequently flip that sheep’s color to Black.

If a proposal written by a sheep fails with a ratio of greater than 2 against votes to 1 for vote and is not self killed or vetoed then the author becomes a black sheep.
If a proposal already has a number of votes on it equal to quorum and the proposal is self killed then the author of said proposal becomes a black sheep.

If a rule entitled “Fleeced” exists then add the following to the body of that rule:

If a sheep’s color is currently Black then any Sheep may change that Sheep’s Fleece to Shorne