beamerouterthemeSaarland.sty

\usepackage{tikz}

\mode<presentation>

\DeclareOptionBeamer{background}{\def\beamer@Saarland@background{#1}}
\ExecuteOptionsBeamer{background=} % Default value is empty
\DeclareOptionBeamer{logo}{\def\beamer@Saarland@logo{#1}}
\ExecuteOptionsBeamer{logo=} % Default value is empty
\ProcessOptionsBeamer

% footer has a uds logo and shows page number only
\setbeamertemplate{footline}
{%
	\leavevmode%
	\hbox{%
		\begin{beamercolorbox}[wd=0.98\paperwidth,ht=2.25ex,dp=1ex,center]{pagenumber}%
			\insertframenumber{}\hspace*{1ex}
		\end{beamercolorbox}
		\if \beamer@Saarland@logo\@empty
		\else
			\llap{\includegraphics[height=0.4cm]{\beamer@Saarland@logo}}
		\fi
	}%
}

% we insert the watermark background from the sidebar
\setbeamertemplate{sidebar right}
{
	\if \beamer@Saarland@background\@empty
	\else
		\vskip.1\beamer@leftmargin%
		\vfill%
		\llap{\includegraphics[width=.5\paperwidth,height=.5\paperheight]{\beamer@Saarland@background}}
	\fi
}

% customisation for the title page
\setbeamertemplate{title page}
{
	\usebeamerfont{title}{\usebeamercolor[fg]{title}\inserttitle}\par
	\usebeamerfont{subtitle}{\usebeamercolor[fg]{subtitle}\insertsubtitle}\par
	\bigskip
	\usebeamerfont{author}\insertauthor\par
	\usebeamerfont{institute}\insertinstitute\par
	\usebeamerfont{date}\insertdate
}

\mode<all>
\endinput