Changing wallpaper
Android
You can change your chats' wallpaper in WhatsApp > More options
> Settings > Chats > Wallpaper.
Alternatively, you can open a chat > More options > Wallpaper.
You can choose from your own photos from the Gallery, Solid Color, Wallpaper Library or Default.
The same wallpaper will be applied to all chats. It's not possible to have different wallpapers per chat.
