take a look at for making your own
http://docs.locusmap.eu/doku.php?id=manual:customization:folder_icons
and in locus store/By usage/Graphic/
you´l find some free for download
http://docs.locusmap.eu/doku.php?id=manual:customization:folder_icons
and in locus store/By usage/Graphic/
you´l find some free for download