\documentclass[xetex,12pt]{scrartcl}
\usepackage{xltxtra,polyglossia,color,colortbl}
\usepackage{pspicture,pst-node,xcolor}
\usepackage{geometry}
\usepackage{array}

\setmainfont[Mapping=tex-text,Scale=1.0]{Charis SIL}
\setsansfont[Mapping=tex-text,Scale=1.0]{FreeSans}
\setmonofont{DejaVu Sans Mono}

\setmainlanguage{english}

% set the new font width, declare the new lengths first
\newlength\MyWidth
\newlength\MyHeight
% set the new lengths
\setlength\MyWidth{<+WIDTH+>cm} % hier die Breite eintragen
\setlength\MyHeight{<+HEIGHT+>cm} % hier die Höhe eintragen

% set new lengths to put the picture
\newlength\MyWput
\newlength\MyHput
\setlength\MyWput{\MyWidth}
\setlength\MyHput{\MyHeight}
% calculate the values by dividing etc.
\divide\MyWput by 2
\divide\MyHput by 2
\addtolength\MyHput{-\MyHeight}
\addtolength\MyHput{10 pt}
\makeatletter
\addtolength\MyHput{\@ptsize pt}
\makeatother

\geometry{papersize={\MyWidth,\MyHeight},total={\MyWidth,\MyHeight}}

\parindent 0pt
\begin{document}\thispagestyle{empty}

% define the colors
%\definecolor{colV}{HTML}{C86464} 
%\definecolor{colK}{HTML}{C89664} 
%\definecolor{colP}{HTML}{C8C864} 
%\definecolor{colH}{HTML}{96C864} 
%\definecolor{colJ}{HTML}{64C864} 
%\definecolor{colM}{HTML}{64C896} 
%\definecolor{colN}{HTML}{64C8C8} 
%\definecolor{colS}{HTML}{6496C8} 
%\definecolor{colR}{HTML}{6464C8} 
%\definecolor{colT}{HTML}{9664C8} 
%\definecolor{colW}{HTML}{C864C8} 
%\definecolor{col1}{HTML}{C86496} 
%\definecolor{col2}{HTML}{BBBBBB}
%\definecolor{colX}{HTML}{C0C0C0}

\definecolor{colV}{HTML}{808080} 
\definecolor{colK}{HTML}{F2F2F2} 
\definecolor{colP}{HTML}{E6E6E6} 
\definecolor{colH}{HTML}{B2B2B2} 
\definecolor{colJ}{HTML}{999999} 
\definecolor{colM}{HTML}{BFBFBF} 
\definecolor{colN}{HTML}{BFBFBF} 
\definecolor{colS}{HTML}{CCCCCC} 
\definecolor{colR}{HTML}{A6A6A6} 
\definecolor{colT}{HTML}{D9D9D9} 
\definecolor{colW}{HTML}{8C8C8C} 
\definecolor{col1}{HTML}{FFFFFF} 
\definecolor{col2}{HTML}{737373}
\definecolor{colX}{HTML}{FFFFFF}

\rput(\MyWput,\MyHput){%
\pspicture[showgrid=false](0,0)(\the\MyWidth,\the\MyHeight)
% Insert your Code here, as you like! Coordinate system starts with 0,0 on the left bottom of the
% page. 
\rput(<+NEWX+>,<+NEWY+>){%
<+CONTENT+>
}
\endpspicture}
\end{document}

