Take a look at these bath bombs from Duffin's Soap Bakery. Don't they look good enough to eat? The presentsation reminds me of a wonderful plate of cookies.
If you would like to see how these bombs were made then check out the article titled Bath Bombs for Fun. The ingredients that were used in this recipe were baking soda, citric acid, fragrance/essential oil, sweet almond oil, witch hazel, colorant and a surprising ingredient of corn flour. I am not sure what corn flour adds to the end product so I am going to ask the author about that particular ingredient in this recipe.