Palm reading? Crystal ball? Tea leaves? Throw Bones? Tarot Cards?
Tarot cards. Only I don't read fortunes through divination or predicting the future, like most people assume. I don't believe predetermination of one's fate is possible. Instead I offer what I call "spiritual advice"; the person asks me a question about themselves, and I draw the cards to see what they have to say. If they don't want to ask a question, I give them a more broad piece of advice or suggestions as per the reading. I'm quite an occult enthusiast, see. I take it very seriously, but I'm not at all bothered if the person doesn't agree with or believe in it. Most people just have their fortunes read for fun.
I also only use the Major Arcana in my readings. I feel they're more symbolic, and the Minor Arcana are more suited for playing cards, in my opinion. I use the original Rider-Waite deck, because it's my favourite interpretation of the cards and I've spent a lot of time learning the symbols and imagery involved. I use a three-card reading; a lot of people use a full spread or "Celtic Cross" reading, which is a lot more in-depth, but which I don't feel is really necessary to get the same effect. Another thing I like about the Tarot is that everyone can have their own way of interpreting the symbols, performing readings and divining the readings. I would honestly consider it the closest thing I have to a religious faith.