For the Astrology-Lover: Seeing Stars: Harness the Power of the Zodiac By Stella Andromeda
If they're big on astrology, then make them feel special with a more personalized gift and get them the Seeing Stars: Harness the Power of the Zodiac By Stella Andromeda ($12). Maybe you can even get one for yourself, too, because the books will look good in the living room together.