Base Fuction

	public static int getRandomFleeceColor(Random random0) {
		int i1 = random0.nextInt(100);
		return i1 < 5 ? 15 : (i1 < 10 ? 7 : (i1 < 15 ? 8 : (i1 < 18 ? 12 : (random0.nextInt(500) == 0 ? 6 : 0))));
	}

Edited for this mod

	public static int getRandomFleeceColor(Random random0) {
		int i1 = random0.nextInt(100);
		return i1;
	}

Normal Drops

	public boolean interact(EntityPlayer entityPlayer1) {
		ItemStack itemStack2 = entityPlayer1.inventory.getCurrentItem();
		if(itemStack2 != null && itemStack2.itemID == Item.shears.shiftedIndex && !this.getSheared()) {
			if(!this.worldObj.multiplayerWorld) {
				this.setSheared(true);
				int i3 = 2 + this.rand.nextInt(3);

				for(int i4 = 0; i4 < i3; ++i4) {
					EntityItem entityItem5 = this.entityDropItem(new ItemStack(Block.cloth.blockID, 1, this.getFleeceColor()), 1.0F);
					entityItem5.motionY += (double)(this.rand.nextFloat() * 0.05F);
					entityItem5.motionX += (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.1F);
					entityItem5.motionZ += (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.1F);
				}
			}

			itemStack2.damageItem(1, entityPlayer1);
		}

		return false;
	}

x2 Drops

	public boolean interact(EntityPlayer entityPlayer1) {
		ItemStack itemStack2 = entityPlayer1.inventory.getCurrentItem();
		if(itemStack2 != null && itemStack2.itemID == Item.shears.shiftedIndex && !this.getSheared()) {
			if(!this.worldObj.multiplayerWorld) {
				this.setSheared(true);
				int i3 = 4 + this.rand.nextInt(6);

				for(int i4 = 0; i4 < i3; ++i4) {
					EntityItem entityItem5 = this.entityDropItem(new ItemStack(Block.cloth.blockID, 1, this.getFleeceColor()), 1.0F);
					entityItem5.motionY += (double)(this.rand.nextFloat() * 0.05F);
					entityItem5.motionX += (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.1F);
					entityItem5.motionZ += (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.1F);
				}
			}

			itemStack2.damageItem(1, entityPlayer1);
		}

		return false;
	}

Specifially these lines

				int i3 = 2 + this.rand.nextInt(3);

				int i3 = 4 + this.rand.nextInt(6);

2 or 4 is the amount of wool you will always get from the sheep, where the 'this.rand.nextInt(3);' or 6 will give you an extra 0 through 3 or 6 in addition to the 2 or 4 you have already been given. This happens simultaneously but I am trying to explain the fuction :)