\documentclass{article}
\usepackage[hks,pantone]{xespotcolor}
\usepackage{xltxtra}
\setmainfont[Mapping=tex-text]{Minion Pro}
\begin{document}
	\color{blue}
	\bf\Huge Blue text color using color package   
	
	\clearpage
        \pagecolor{white}     
  
	\SetPageColorSpace{PANTONE}
	\SpotColor{PANTONEGreenPC}{1.0}
	\bf\Huge Pantone spot color
	
	\clearpage
	\SetPageColorSpace{HKS}
	\SpotColor{HKS68N}{1.0}
	\bf\Huge HKS spot color
	
	\clearpage
	\NewSpotColorSpace{SOMECOLORSPACE}
        \AddSpotColor{SOMECOLORSPACE} {SOMECOLOR} {Spot\SpotSpace Color\SpotSpace Name\SpotSpace in\SpotSpace PDF} {0.5 1.0 0.51 0}
	\SetPageColorSpace{SOMECOLORSPACE}
	\definecolor{Spots}{spotcolor}{SOMECOLOR,1.0}
	
	\SpotColor{SOMECOLOR}{1.0}
	\bf\Huge Self defined spot color\\
	Some shades are also possible:\\
	\SpotColor{SOMECOLOR}{1.0}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.9}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.8}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.7}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.6}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.5}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.4}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.3}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.2}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.1}\rule{1cm}{1cm}\\
	\SpotColor{SOMECOLOR}{0.0}\rule{1cm}{1cm}

	\clearpage
	\pagecolor{Spots} 
	\SpotColor{SOMECOLOR}{0.1}
	A spotcolor as background color.

	\clearpage
	\pagecolor{white}
	\colorbox{Spots}{xxx}
\end{document}
