About Notepad++ Theme Editor

Created by Margaryta Tyshkevich, Olesya Yaremenko and Roman Kobzar.

Implemented plugins / libraries, created by other developers :

jQuery Color Picker Plugin by Jose Vargas.
Downloadify JavaScript + Flash library for client side file creation by Doug Neiner.

To install a theme for your Notepad++ ...

Move its XML file into your C:\Program Files (x86)\Notepad++\themes folder.
Restart Notepad++ ...
Choose the theme from a drop-down list in Settings > Style Configurator... .