This is a highly customizable GUI texture for games. As the tittle suggests it can be used in any color variety because it is using the color pallet in Unity.
By using this method the elements can be colored from code. This was created so it would be mobile friendly . It uses only one texture (1024x1024 ) to not waste draw calls. The package include 40 icons a font and all the things you need to make a fully functional interface. The art was done in Adobe Flash so if you want to edit the images you have the source file included in the package.