Convert Curves to Grease Pencil? I'd like to know if there's a way/add-on to convert curves to Grease Pencil strokes? I know you can convert in the other direction, but I can't find anything to create Grease Pencil strokes from curves.

In attempting to setup guides for a model I'm working on, did so using curves. I'm now thinking GP would have been the better option, and would rather not have to recreate my guides.
First convert your curves in to mesh objects, AltC > Mesh from Curve/Meta/Surf/Text.

Now just copy and paste the script below into blender's text editor, then with your object still selected press Run Script.

This script below will draw grease pencil strokes on the active object. 

import bpy
from mathutils import Vector

obj = bpy.context.object
mesh = obj.data
scene = bpy.context.scene

pencil = bpy.data.grease_pencil.new("pencil")
scene.grease_pencil = pencil

layer = pencil.layers.new("layer", set_active=True)
frame = layer.frames.new(scene.frame_current)

for edge in mesh.edges:
    stroke = frame.strokes.new()
    stroke.draw_mode = '3DSPACE'

    stroke.points.add(2)
    stroke.points[0].co = obj.matrix_world * Vector(mesh.vertices[edge.vertices[0]].co)
    stroke.points[1].co = obj.matrix_world * Vector(mesh.vertices[edge.vertices[1]].co)


Thanks to CoDEmanX for his making a grease pencil through bpy answer.