This add-on lets you customize avatar markup up to your liking (i.e. how avatars should look like). By default it only adds a complimentary gradient, which can be changed in Style Properties → Avatars → Dynamic avatar gradient color function.
If you want to further expand on customizations feel free to edit avatar public template.
Here's before and after enabling the add-on with the default settings:
If you want to further expand on customizations feel free to edit avatar public template.
Here's before and after enabling the add-on with the default settings: