Just as important as what can they make is what in the world will the congregation buy when you put these things on sale? Maybe Bible covers would be good. Almost anything for babies or toddlers, sleeping mats for kindergarten kids, children's bath robes, babies' towels, mother/daughter anything. Maybe something the church needs that people can buy when they wouldn't buy anything for themselves. I would definitely approach it from what will sell first rather than from what they can make, because no matter what they make, it is useless if it doesn't sell, considering what your purpose is.