One time, notice that I said ONE time, yes that is only ONCE, we used walnut hulls mixed with sumac berries with the wax floating on top. In the house no less. God awefull stench! Traps looked like they had been dipped in tar. With just the dye and no wax, they looked pretty good.
Never again will I boil walnut in the house. Never, never neverever again.