Business Calendar offers you 22 pro themes. In order to set it up go to the BC 2 → Settings.
Choose the → Theme & background colors category.
Select the theme that is the most pleasing for your eyes.
If you want it blue, gray or red, right now you can fully personalize your app in terms of coloring. Apart from the custom themes, you can also set your fully individual custom colors for bars, drawers, FAB, previous and next months and weekdays. Just click on the box icon to choose the category and select your color.
You can set your Business Calendar in a unique, personal way.