The Android Material Theme Generator allows you to customize your calendar colors effectively. Here’s a suggested color palette for a calendar theme:

• Primary Color: #6200EE (Deep Purple)
• Primary Variant: #3700B3 (Dark Purple)
• Secondary Color: #03DAC5 (Teal)
• Background Color: #FFFFFF (White)
• Surface Color: #F5F5F5 (Light Gray)
• Error Color: #B00020 (Red)
• On Primary Color: #FFFFFF (White)
• On Secondary Color: #000000 (Black)
• On Background Color: #000000 (Black)
• On Surface Color: #000000 (Black)
• On Error Color: #FFFFFF (White)

You can input these colors into the Android Material Theme Generator to create a cohesive and visually appealing calendar theme for your application.