A long time ago, I experimented with runes ("runic divination"). These are usually ceramic, wooden, or stone chips with letters from the old Scandinavian alphabet inscribed on them.
In pre-Christian times, they were sometimes used for supposedly gaining a "supernatural" view of issues (and conveniently supporting a religious power structure). The exact process of this was lost in the Christianizing process in Europe. No one today knows how exactly it was performed. They were mostly used for simply writing, though. Like etching one's name on property or putting up memorial stones, etc.
The current, modern-day practices are largely derived from a man named Guido von List. Basically, there is no direct connection between the old practices and the modern practices. Anyone who tells you there is either ignorant or lying to you.
Anyway, I did experiment with these, because I am curious about everything in our world and I want to verify whether they are true.
My conclusion is that practices like these are... well, bunk. I find that if they "reveal" anything at all, it reveals what you already knew in your sub-concious.
"Should I travel through a blizzard to get somewhere?"
"Doesn't look like a good idea." (Duh.)
"How can I make my relationship better?"
"You should try more communication." (Duh.)
"Should I date so-and so?"
"Why don't you talk to the person yourself and stop asking a bunch of wood chips??" (Actually, they don't say that... lol)
I think there is danger in using stuff like this. It is not that there's any spiritual danger. They're just wood chips after all.
The danger is that it's easy for your sub-concious to see what it wants to see and think that it is real. It isn't real. There's no spiritual force communicating through those things. Any common-sense stuff that pops up, YOU ALREADY KNEW, by virtue of your human experience. You don't need 'divination tools.' What you need is to pay attention to your own knowledge and use common sense.
Check out James Randi's material on 'divination.' If you think it's real, and you have skillz, try and win his Million Dollar Prize for proving such things are real. It hasn't been won yet.
Don't miss his talk about psychics. (Captioned.)
James Randi's fiery takedown of psychic fraud | Video on TED.com