Hi.
By adding fill and stroke definition, the icons could be made «QGIS» friendly. It adds possibility to changed both filled and stroke colours.
To proof the concept, a bash script based on 'sed' was created. Two sets of icons was generated – normal and with reverse colour scheme.
colourful_qgis_icons.sh.txt
Filled icons:

Outlined (reverse) icons:

I hope, somebody will find this useful.
Hi.
By adding fill and stroke definition, the icons could be made «QGIS» friendly. It adds possibility to changed both filled and stroke colours.
To proof the concept, a bash script based on 'sed' was created. Two sets of icons was generated – normal and with reverse colour scheme.
colourful_qgis_icons.sh.txt
Filled icons:
Outlined (reverse) icons:
I hope, somebody will find this useful.