My favorites additives are:
- Colloidal oatmeal (Aveno)
- Plain Greek Yogurt (I make my own)
- Cucumber (skinned and blended to a "liquid" in a Nutribullet)
- Avocado (skinned and pureed in Nutribullet)
- Canned pumpkin
- Cinnamon (pumpkin and cinnamon makes a pretty fall soap)
- Cocoa powder (ditto)
- Coconut milk (you can refrigerate it and separate the "water" from the oil and use the oil as part of your oils and use the "water" as part of your water, added to oils after adding your lye/water)
- Coffee water made with distilled water
- Fine Coffee Grounds, used, from above (makes a scrubby soap - looks nice in an all white soap)
- Poppy, Cranberry seeds
- Infused Turmeric, Paprika, Rosemary (most any herbs or spices, really. Used as a colorant, herb smell usually doesn't last. Gel for a nicer color.)
- Finely crushed dried dill weed
- Activated Charcoal
- Pumice
PS. If I use frozen coconut milk - as I add the coconut/lye to the oils, I strain the liquid through a Tea Strainer. It is a small, fine sieve, which will keep any lye solids out of the soap.