I use lavender essential oil in my coconut oil bars. (coffeewithus3.com)
I have started making coconut oil bars with Young Living essential oils. (coffeewithus3.com)
If you don't have Eucalan, use some olive oil bar soap (Kiss My Face makes some) or other gentle soap such as Dr. Bronners or even Ivory bar soap will work fine. (greenmountaindiapers.com)