Great ideas! I have used the Olive Oil. Just about every pregnant friend I have has used the coconut. Grapeseed is another one that has become very popular as a great body oil.
What NOT to use: Peanut butter in your hair. No matter what your eight year old friends told you to do. It was hard to come out, it will get you grounded and your hair will not look like Kelly Kapowski's from Saved by the Bell

. I have heard equally horrifying stories about mayo as a conditioner.