List of available icons
White icons only have a grey background on this documentation page for readability purposes.
Svg color api
The svg API is not supported anymore due to performance reasons.
Material design icons
If you need more than the shipped default icons, using the material-design-icons would be a good idea. For usage with vuejs look over here: https://nextcloud-vue-components.netlify.app/#/Components/NcIconSvgWrapper