I know there are some users who really liked the holo theme so I wanted to put together a quick guide on how to get a similar style/look in 3.0. Its not perfect by any means but its the closest thing possible moving forward.
Theme Colors
Lets start with getting the colors to match
- Go to Settings - UI - Theme Builder
- Disable Dynamic theme
- Choose Primary Color -> Black
- Choose Primary Dark -> Black
- Choose desired accent color
- Choose Base Theme - Material Black
The library view should now look like this:
Setup View Mode
In each library view with artwork, select 'View Mode' from the toolbar menu and choose 'List'
The library view should now look like this:
Setup Tabs
From the library view select Customize - Enabled Views from the toolbar menu. This will bring you to a UI that allows you to add/remove/reorder the tabs. Add your desired tabs with the plus floating action button and reorder the views by drag and dropping the handle icon on the left side of the item.
The library view should now look like this:
Optional: Details Views
Select an artist, album, or album artist to enter the details view. Toolbar menu - Customize - Uncheck Show Artwork
This will make the detail view a bit more condensed similar to holo themes
Also when scrolling down on most views it hides the top toolbar: