Locating an image file in a pyGame
You don't necessarily need classes in Python. The helper class approach is the same direction as I would go, just with a plain module.
Basically, your resource_path and img_folder_path are constants, so I would simply create a module constants.py with the following:

import os

RESOURCE_PATH = os.path.join(os.path.realpath(__file__), 'Resources')
IMG_FOLDER_PATH = os.path.join(resource_path, 'Images')


You can then simply import constants.py everywhere you need to know those paths.