Rice Bran Oil and Olive Oil. I would do something with 15% PKO, 25% RBO, 25% Olive, 15% Plam, 10% Shea Butter and 10% Castor edit: sorry i just saw the above post. Rice Bran oil has simular properties as Olive, however it makes a harder bar. If you are trying for a mild soap, always use Olive as the base, but also add RBO to harden it up and prevent the slime.