Get More Colors For Google Calendar. Adds more colors to google calendar's color selection menu. Repeat these steps for all your calendars.

Tap the three horizontal lines on the top left corner. Changing the calendar color on a computer.
Click The + Sign To Choose A Custom.
Then, click the plus icon below the available.
Choose A Color From The Preset Options.
Independent side project of experimenting with various color palettes for my google calendar.
Enter Your Different Events In The Calendars To Populate Them.
Images References :
While Google Calendar Doesn’t Provide An Official Way To Add More Colors, There Are Some Workarounds That Users Have Found:
This extension adds the ability to insert custom colors into google calendar events.
Click The + Sign To Choose A Custom.
Adds more colors to google calendar’s color selection menu.
Repeat These Steps For All Your Calendars.