I know that this is comming from an agnostic, not what you wanted, but OBE's, in my opinion, are just dreams, perhaps not even lucid dreams. In an OBE, the dreamer believes that they have left thier body and are 'Floating' in the room. But please, consider this, our memories are very powerful things, it's not unlikelyy that you mind could re-create the enviroment arround you, in this dream. People who claim to have left thier body in a lucid dream, turning it into an OBE, seem to have lost thier lucidity, rather than reached somthing higher than it. OBE's have been reported in intense lucid dreams, perhaps the mind cannot handle that much lucidity, thus the subconsious tries to take back control, changing the dreamscape.

This is just a theory though.