This documentation explains how to override the default settings so that you can customize Avalon for your own needs.
To set the default look for the :title yield block in the file app/views/layout/hydrant.html.erb
Avalon Media System
To add additional context add a content_for block in the current template. The free text will be prepended to the application's default label. For example one screen (views/media_objects/_basic_metadata.erb) may be tailored to read
Ingest workflow – Avalon Media System
Since Avalon is built on top of Twitter Bootstrap, customizing the interface to match your own theme is very straightforward. Within the file app/assets/stylesheets/branding.css.sass you can override any default Bootstrap variables. Since it will respect your defaults they wil be used when calculating the color schemes, grid sizes, and other places throughout the front end.