You get dozens of options for personalization. WhatsApp has been working on chat-specific theme support for a few months now, and the good news is that

WhatsApp will soon allow users to customise their chats with a new chat theme feature. The feature is currently in beta testing. Once available, the feature will allow users to personalise individual chats with a variety of themes and colours.

For reference, currently, theme options within the app only offer System Default, Light, and Dark. With the Google Play Beta Program's WhatsApp version 2.24.21.34, however, users on Android can expect to see up to 22 new chat themes with up to 20 different color options, as highlighted by WABetaInfo.

WhatsApp has come up with a new customizing feature, which will enable the user to add new Chat Themes. The new feature will let you choose from 22 different theme colours to use them as your chat backgrounds.