We could create a white mask for each horse based on parents and then have some mutation and so on
[Solution live 2017-12-18]
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Test script at http://dev.dreamhorse.se/custom_content/pages/test.php
It is installed, but we must test inheriting these new masks!
Using big_thick results in weird situations because the mane is bigger than on the other ones. So read normal in too and if there is green on either big or normal, we are on body!