Hi chakajo75, I've never heard of these types of readings but that doesn't mean they don't occur. It does remind me though of gazing into an open fire, and looking to see what you can see and relaying this.
I would guess this would be more a psychic reading rather than being messages from spirit. My reason for this is flames cannot speak therefore they cannot prove life exists after physical death. Which to me is why someone would want to communicate with their guides for. Then again I cannot speak for everybody.
I hope you manage to find out more.
It's not what happens to us that matters but how we handle what happens to us