Slice the loofah into ½ - 1 inch thick pieces, depending on how big you want your soaps and drop one in each baking cup. I sliced mine about ½ inch.

Chop up a few ounces of the melt and pour soap base and place in glass measuring cup along with a drop or two of colorant.  Microwave until melted. Check color if it is too dark add more base, too light another drop of color. Once at the color you like, add a few drops of essential oil. Stir then slowly pour over loofah. Make sure to saturate the loofa sponge with the base mixture and don't fill much past depth of sponge.

Repeat until all slices are covered.  As you refill the measuring cup adjust the color a little to make complimentary color shades of soaps all in the same color family.  If you want contrasting colors use another cup/bowl or wash between colors.

Allow it fully cool before popping them out of molds. If you are in a hurry, feel free to place them in the refrigerator, but not the freezer.