**Kinda like this.**

[![enter image description here][1]][1]

In hoping for an answer to https://blender.stackexchange.com/questions/197349/instancing-a-space-theme-with-a-draw-callback will add an edit to it here

If you set one node editor to world, it changes the color of the other, and labels the world one (correctly). The idea is to both label and color the same one, but... _hence the question_.


    import blf
    import bpy


    highlight_color = (0.8, 0, 0.5)

    class DrawingClass:
        def __init__(self, prop):
            from bpy import context
            self.prop = prop
            self.col = context.preferences.themes[0].node_editor.space.back[:] 
            self.handle = bpy.types.SpaceNodeEditor.draw_handler_add(
                self.draw_text_callback, (), 'WINDOW', 'POST_PIXEL')

        def draw_text_callback(self):
            from bpy import context
            font_id = 0  # XXX, need to find out how best to get this.
            if not hasattr(context, "scene"):
                return None
            space = context.space_data
            if space.shader_type == 'WORLD':
                context.preferences.themes[0].node_editor.space.back = highlight_color
                # draw some text
                blf.position(font_id, 18, 50, 0)
                blf.size(font_id, 50, 72)
                blf.draw(font_id, f"{self.prop}")

            else:
                context.preferences.themes[0].node_editor.space.back = self.col

        def remove_handle(self):
            from bpy import context
            context.preferences.themes[0].node_editor.space.back = self.col
            bpy.types.SpaceNodeEditor.draw_handler_remove(self.handle, 'WINDOW')


    dc = None


    def register():
        global dc
        dc = DrawingClass("World")

    def unregister():
        global dc
        if dc:
            dc.remove_handle()
            dc = None

    if __name__ == "__main__":
        register()

  [1]: https://i.sstatic.net/oUT4o.gif