Style file with demo

beamerthemesimple.sty

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+% Copyright 2015 by Facundo Muñoz
+%
+% This file may be distributed and/or modified
+%
+% 1. under the LaTeX Project Public License and/or
+% 2. under the GNU Public License.
+%
+
+
+\ProvidesPackage{beamerthemesimple}
+
+%\def\beamer@simplecolor{gris}
+%\DeclareOptionBeamer{color}{\beamer@simplecolor=#1}
+%\ExecuteOptionsBeamer{gris}
+%\ProcessOptionsBeamer
+
+\usepackage{tikz}
+\usetikzlibrary{arrows,shapes,trees,positioning,fadings}
+
+\input xkeyval
+
+\newcommand<>{\includeoverlaygraphics}[2][]
+{
+  \begin{tikzpicture}
+    \alt#3{\node[opacity=1] {\includegraphics[#1]{#2}};}
+          {\node[opacity=.15] {\includegraphics[#1]{#2}};}
+  \end{tikzpicture}
+}
+
+% These define macros \KV@setwatermark@hoffset that take one argument
+% which is processed by the last piece of codes into braces
+\def\@hos{}
+\def\@vos{}
+\def\@alpha{} % This one does not work. Why?
+\define@key{setwatermark}{hoffset}[\def\@hos{.}]{\def\@hos{\hspace*{#1}}} 
+\define@key{setwatermark}{voffset}[\def\@vos{.}]{\def\@vos{\vspace*{#1}}} 
+\define@key{setwatermark}{alpha}[\def\@alpha{0.7}]{\def\@alpha{#1}} 
+
+\def\setwatermark{\@ifnextchar[\@setwatermark{\@setwatermark[]}}
+\def\@setwatermark[#1]#2{%
+  \setkeys{setwatermark}{#1}%
+  \def\@watermark{#2}
+}
+% \newcommand{\setwatermark}[1]{\def\@watermark{#1}}
+\setwatermark{}   % Empty initialization
+
+
+\mode<presentation>
+
+  % http://www.colorcombos.com/color-scheme-275.html
+  \definecolor{destacado}{HTML}{515151} % gris oscuro
+  \definecolor{normal}{HTML}{797979}  % gris medio
+  \definecolor{fondo}{HTML}{e6e6e6}  % gris claro
+
+  \setbeamercolor{normal text}{bg=white,fg=normal}
+  \setbeamercolor*{block title}{bg=fondo,fg=destacado}
+  \setbeamercolor*{block body}{bg=fondo,fg=normal}
+  \setbeamercolor{alerted text}{fg=black}
+
+  \usetheme{default}
+%  \usecolortheme[named=gris]{structure}
+  \usecolortheme[named=destacado]{structure}
+  \usefonttheme{structurebold}
+
+  % overlays semitransparentes
+  \setbeamercovered{transparent}
+
+  % incluir el contador de diapos
+  \setbeamertemplate{footline}[frame number]
+
+  % eliminar íconos de nav.
+  \setbeamertemplate{navigation symbols}{}
+
+  % bloques
+  \setbeamertemplate{blocks}[rounded][shadow=true]
+
+  % especificación global para listas
+  %\beamerdefaultoverlayspecification{<+-| alert@+>}
+
+  % márgenes
+  \setbeamersize{text margin left=0.4cm,text margin right=0.4cm}
+
+  \setbeamertemplate{background}{
+  \parbox[c][\paperheight]{\paperwidth}{%
+    \vfill \hfill 
+    \begin{tikzpicture}
+      %\node[opacity=\@alpha]  % not working. why?
+      \node[opacity=.07]
+      {
+        \@watermark
+      };
+    \end{tikzpicture}
+    \@hos
+
+    \@vos
+  }
+} 
+
+\mode
+<all>

demo.tex

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+\documentclass{beamer}
+
+\usetheme{simple}
+
+\usepackage{lmodern}
+\usepackage[scale=2]{ccicons}
+
+% TODO: 
+%   position adjustement
+%   change colours
+%       
+
+% Watermark background (simple theme)
+
+\setwatermark{\includegraphics[height=8cm]{img/Heckert_GNU_white.png}}
+
+
+\title{A simple beamer theme}
+\subtitle{}
+\date{\today}
+\author{Facundo Mu\~noz}
+\institute{\url{http://github.com/famuvie}}
+
+\begin{document}
+
+\maketitle
+
+\begin{frame}{simple}
+  \framesubtitle{A beamer theme}
+
+  \texttt{simple} is a minimalist Beamer theme that features
+
+  \begin{columns}
+    \column{.5\textwidth}
+      \begin{itemize}
+        \item a \alert{watermark} logo in the background
+        \item slide \alert{numbers}
+        \item \emph{emph}asized and \alert{alert}ed text
+      \end{itemize}
+
+    \column{.5\textwidth}
+      \begin{block}{And of course...}
+         blocks, columns, and all Beamer power
+      \end{block}
+  \end{columns}
+
+\end{frame}
+
+
+
+\setwatermark{\fontsize{125pt}{125pt}\selectfont{Simple}}
+
+\begin{frame}[fragile]{watermark}
+  \framesubtitle{not only for images}
+
+  \begin{itemize}
+    \item You can place \emph{any} \LaTeX{} \alert{contents} as a watermark
+  \end{itemize}
+
+  \begin{block}{In preamble}
+    \begin{verbatim}
+     \setwatermark{\includegraphics[height=8cm]{%
+                   img/Heckert_GNU_white.png}}
+    \end{verbatim}
+  \end{block}
+
+  \begin{block}{Just before this frame}
+    \begin{verbatim}
+     \setwatermark{\fontsize{125pt}{125pt}%
+                   \selectfont{Simple}}
+    \end{verbatim}
+  \end{block}
+
+
+\end{frame}
+
+
+
+\setwatermark[hoffset=-3cm,voffset=-2cm]{\fontsize{125pt}{125pt}\selectfont{Simple}}
+
+
+\begin{frame}{Options}
+  \framesubtitle{Fine adjustement of the watermark position}
+
+
+  \begin{itemize}
+    \item \texttt{hoffset}
+    \item \texttt{voffset}
+  \end{itemize}
+
+  They admit any \emph{positive} or \emph{negative} spacing \alert{unit}
+
+  Note that some \alert{warnings} about \emph{badboxes} might be generated at compilation
+
+\end{frame}
+
+
+
+
+\begin{frame}{License}
+
+  \begin{block}{Get the source of this theme and the demo presentation from}
+
+  \begin{center}\url{http://github.com/famuvie/beamerthemesimple}\end{center}
+
+  \end{block}
+
+  The theme \emph{itself} is licensed under a
+  \href{http://creativecommons.org/licenses/by-sa/4.0/}{Creative Commons
+  Attribution-ShareAlike 4.0 International License}.
+
+  \begin{center}\ccbysa\end{center}
+
+\end{frame}
+
+\end{document}
+