\documentclass[landscape,pagesize]{scrartcl}

\newcommand*{\fname}{Leaflet}
\newlength{\rand}
\setlength{\rand}{2mm}

\pdfminorversion 3
\usepackage{calc}
\setlength\paperheight{210mm+2\rand}
\setlength\paperwidth{297mm+2\rand}

\usepackage{pdfpages,xcolor,picture}

\newcommand*\FarbRandI{%
  \AddToShipoutPicture*{%
    \AtPageLowerLeft{%
      \textcolor{white}{\rule{\paperwidth}{\paperheight}}}%
  }%
  \AddToShipoutPicture*{%
    \put(99mm+\rand,0mm){%
      \textcolor[RGB]{255,237,0}%
%       \textcolor[cmyk]{0,0,1,0}%
	  {\rule{99mm}{\paperheight}}}%
  }%
  \AddToShipoutPicture*{%
    \put(198mm+\rand,0mm){%
      \textcolor[RGB]{0,77,159}%
%       \textcolor[cmyk]{1,.5,0,0}%
      {\rule{99mm+\rand}{\paperheight}}}%
  }%
}
% [RGB]{0,77,159} [RGB]{255,237,0}
\newcommand*\FarbRandII{%
  \AddToShipoutPicture*{%
    \AtPageLowerLeft{%
      \textcolor{red}{\rule{\paperwidth}{\paperheight}}}%
  }%
  \AddToShipoutPicture*{%
    \put(\rand,\rand){%
      \textcolor{white}{\rule{297mm}{210mm}}}%
  }%
}

\begin{document}
  \FarbRandI
  \includepdf[pages=1,noautoscale]{Leaflet.pdf}
  \FarbRandII
  \includepdf[pages=2,noautoscale]{Leaflet.pdf}
\end{document}
