tikz_test.tex

\documentclass[12pt]{report}

\usepackage{lmodern}
\usepackage[dvipsnames]{xcolor}

\usepackage[demo]{graphicx}
\usepackage[all]{background}

\usepackage{lipsum}
\usepackage{showframe}
\usepackage{tikz}

\newcommand{\MyGraphicLogo}{% For imported graphic logo
\begin{tikzpicture}[remember picture,overlay,yshift=-2cm, xshift=2cm]
  \node at (0,0) {\includegraphics[width=2cm,height=2cm]{foo}};
 \end{tikzpicture}
}

\newcommand{\MyTikzLogo}{% For a logo drawn with TikZ
\begin{tikzpicture}[remember picture,overlay,yshift=0cm, xshift=0cm]
  \filldraw[fill=Cerulean, draw=black] (0cm,0cm) 
        -- (\paperwidth,  0cm) 
        -- (\paperwidth, -2cm)
        -- (.5\paperwidth+1cm, -2cm)
        -- (.5\paperwidth-1cm, -3cm)
        -- (0cm, -3cm)
        -- cycle;
 \end{tikzpicture}
}


%\SetBgContents{\MyGraphicLogo}% Select included image
\SetBgContents{\MyTikzLogo}% Select tikz picture

\SetBgPosition{current page.north west}% Select location
\SetBgOpacity{1.0}% Select opacity
\SetBgAngle{0.0}% Select roation of logo
\SetBgScale{1.0}% Select scale factor of logo



\begin{document}

\section*{Lorem Ipsum}
\lipsum[1-50]

\end{document}