Notepad++ is undoubtedly the most powerful Text Editor for the Windows Platform. Apart from Plugins we also have various custom themes to Notepad++. Themes are nothing but XML files with color definitions for various parameters and are Programming language-specific. By default, stylers.xml theme is applied to Notepad++ and there are 20 other themes available.
To Apply a theme goto Menu : Settings -> Style Configurator -> Select Theme Dropdown

Notepad++ Themes Demo.gif
Default Theme:

1 Default Theme

2 Bespin.png

3 Black board.png
Some of the Themes available:
- Bespin
- MossyLawn
- Navajo
- Obsidian
- Plastic Code Wrap
- Ruby Blue
- Solarized-Light
- Solarized
- Twilight
- Vibrant Ink
- Vim Dark Blue
- Black board
- Zenburn
- Choco
- Deep Black
- Hello Kitty
- HotFudgeSundae
- Khaki
- Mono Industrial
- Monokai
More Posts related to NotepadPlusPlus,
- Notepad++ Editor alternatives for macOS
- How to add or remove bookmark on a line in Notepad++
- Notepad++ do not show CRLF characters
- Reduce the size of Tabs on Notepad++
- Delete blank lines in a file using Notepad++
- Fix: Notepad++ bottom status bar not visible
- Notepad++ Hex Editor
- How to show End of Line Characters in File using Notepad++
- [Tutorial] Write And Run Python Code In Notepad++ Editor
- How to install XML Tools Plugin Notepad++
- Customizing Notepad++ New Document Line Encoding: CR/LF/CR LF
- How to remove blank lines from a file using Notepad++
- Column Mode Editing in Notepad++
- Convert text to random case using Notepad++
- How to recover unsaved notepad file Windows 10
- How to delete all text after a character or string in Notepad++
- Setting up Cloud feature with Notepad++
- Install Notepad++ silently using Windows Powershell
- Using Document Map in Notepad++
- Enabling Notepad++ Dark Theme
- [Fix] Notepad++ tab not visible (hidden)
- Where are Notepad++ macros stored?
- Multiple line editing in Notepad++
- Alternatives for Notepad++ on Mac in 2021
- [Nopepad++] How to add text at end of each line
More Posts:
- How to save All Files at once in Notepad++ - NotepadPlusPlus
- Hide Scrollbar from Android Views - Android
- Microsoft Sign-in Error Code: 50058 (Request Id, Correlation Id and Timestamp) - Microsoft
- Android : Connection with adb was interrupted 0 attempts have been made to reconnect - Android
- How to Compare Strings in Bash Script - Bash
- Fix: Spring Boot REST HTTP Status 415 - Unsupported Media Type Error - Java
- Access Windows share folder in Ubuntu Device in Network - Ubuntu
- Change Android Toast background color - Android