I also like to use just plain olive oil in my hair...now this is not recommended for everyone, but those of you with thick course hair like mine know that it gets so dried out this time of year and looses its shine. When I have time I will do a deep olive oil treatment where I apply it to my clean damp (not soaked) hair and wrap plastic wrap around to then leave it on for an hour or more. You can also use the hair dryer (plenty away from your head!!) to heat up the oil under the wrap. Remove wrap, rinse and style as usual. I also like to use just a little!! little!! (a little goes a long way!!) bit on my hair as a spot shine product...don't use too much because it can get greasy but it is the perfect at-home solution for hair that is less than lack luster!!
UPDATE 12/22..I forgot to mention another thing I use olive oil for...my cuticles! It is such a great oil to dab onto those dry torn up nails! If anyone else has any uses of olive oil for beauty maintenance...let me know I would love to hear about them!