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Are you saying to use the ground wire as a neutral??
In North America, the hot wire is black, the neutral is white, and the ground wire is a bare wire.
Even though using the ground as a neutral will work, I don't think that codes allow for this. Under certain circumstances, the ground could become energized and you will be in for a nasty surprise. Not only that but the conductors (hot and neutral) are typically 14 AWG (American Wire Gage), whereas the ground is substantially smaller at 18 AWG. Using the ground as a neutral could conceivably overload the neutral.
I would recommend the job be done properly and run a new wire altogether to a separate GFI recepticle in the washroom. (I.e. do not gang the boxes since there will be two separate circuits in one box.)
You could put the recepticle in the ideal location for the drier since the switch is most likely just inside the door.
OR,
Odds are the electrician who wired the house ran the power to the light fixture you could jump a wire off of there.
Remove the light fixture and determine which wire brings the power in. The electrician would have connected the white wire of the switch to the hot wire of the feed, then ran the black wire back from the switch to the lamp fixture.
The neutrals will all be ganged together and feed the other side of the light.
If you have access from the attic, it will be very easy to feed a new piece of Romex into the existing light fixture box, then drop it down inside the wall cavity where you want to locate your recepticle. Then connect the GFI recepticle.
Job finished and properly to boot.
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