You could use just about any kind of oil that you want!!! If you're going to market & sale the scrubs, then cooking oils are not the best choice.
I like using olive oil or a rubbing oil mix with sugar because I find it less abrasive than salts, and then I enjoy adding some combination of ES oil............actually some times I initially leave my scrub neat, without any ES Oils put in it, and later before I'm about to use it I separate a portion of the scrub and add some ES Oils that best suits my mood & needs at the time!!