For more image file sets, look for zip files online here:

    http://learning-python.com/AlternateMonthImages

Fetch and unzip into a month images folder on your machine,
or use 12 photos or images of your own.  

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UPDATE: the online image sets have not been changed recently,
and may or may not be expanded in the future.  See also the 
image sets shipped with this package, and ..\README.txt for 
more details on using and configuring month image file 
folders of your own.