I made a functioning Spirit Board (Ouija is a brand name) out of cardboard and a sharpie. And it was pretty damn successful. It was part of the Mastering Divination Course, so I have my results recorded.
On day one a spirit named Roger gave me a poetry recommendation.
But, I do agree with @Nagathex, the Spirit Board relies on the ideometer effect and so can easily be controlled and manipulated and there are leagues better forms of divination which you can use to contact the deceased.