As a Snapchat+ subscriber, you can change the color of your username in Chats with your friends.
To change the color of your username in Chats
- Go to the Friendship Profile or Group Profile you want to customize
- Under the 'Our Chat' section, tap 'Chat Color'
- Choose a color
- Tap the blue checkmark to save
You can also change your Chat message color in your Snapchat+ settings.