Green food colouring, lots
We made a basic white bread dough using water that included quite a lot of food colouring. We added only enough water to leave some dry ingredients at the bottom of the bowl so we could carry on adding colouring to the dough until we thought we had enough to give the final bread a good green colour.
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The colouring we used was a sage colour, which made a bread that looked almost exactly like it was mouldy the whole way through - which is a shame because it tasted great. Next time we'll use a brighter, crazier green, so it looks properly jokey rather than suspect.