Yes. Since at least Blender version 2.65, the grease pencil has included a "convert" button, one of the options of which was to convert the grease pencil work to a bezier curve. Selecting the bezier curve, and applying the command ALT-C permits the conversion of the bezier curve to a mesh object. From there it's just a matter of applying standard modeling techniques to convert the edges to quad faces. The following image exemplifying this technique was made by adding a bezier curve to a scene in top orthographic view, selecting all vertices, witching to front orthographic view, and extruding along the z axis.
At some point, changes to the grease pencil made the process easier, since version 2.78 gives as one of the options of the convert button in the grease pencil tool panel, direct conversion from the grease pencil to a "polygon curve". However, I have no direct experience with trying to make that conversion.