I have a rigged mesh and am at the point where I'm trying to pretty it up. I've created a few controller bones that I use to drive the IK. I'd like to change their appearance by setting their Display/Custom Shape property. Coming from Maya, I'm used to using NURBS shapes to make easy to identify shapes. However, when I create a NURBS curve and use it as my bone's custom shape, nothing is displayed in the viewport. I can set it to meshes or empties and they display fine - but not NURBS paths.
Is there a way I can use NURBS paths as my custom display shape?