Eklenti Dynamic Avatar Styling 1.0.1

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:
Before:

After:

Please bear in mind that it doesn't use any caching yet, so it will slow down your forum performance.