openpli skins dont work on openatv builds and vice versa.
The screen names and elements are different. You would have to rewrite a huge chunk of code to get it working.
Hence why on forums, you have sections for oe-alliance skins and openpli skins
picon folder on openatv in your case would be /media/hdd/picon
but you got no picon as you are on a folder not a channel.???