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
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