Where do I obtain a DIKU front page style for my thesis?

I recommend downloading ku-forside.zip from http://www.math.ku.dk/~m00cha/, finding the necessary images within it and using the images directly. This only adds approximately five lines to your .tex file and no dependencies outside your TeX installation. Also, you don't need to change any encoding.

For example, if I want to use the old SCIENCE graphics in English, I select nat-farve.pdf and nat-en.pdf and copy them into my working directory. Or if I want to use the red KU logo in Danish, I select ku-farve.pdf and ku-da.pdf instead.

Below is an example of the only extracts of the ku-forside package that actually need to be used. Pay attention to the three lines that begin with \AddToShipoutPicture. You need to include the package eso-pic before this works. These images might not be compatible with your margins, so one way to fix this is to set the margins using the geometry package as below. Another way is to use \includegraphics*[width=\pagewidth,height=\pageheight,keepaspectratio]{...}.

\documentclass[11pt]{article}
\usepackage[a4paper, hmargin={2.8cm, 2.8cm}, vmargin={2.5cm, 2.5cm}]{geometry}
\usepackage{eso-pic} % \AddToShipoutPicture
\usepackage{graphicx} % \includegraphics

\author{\Large{Simon Shine} \\ \texttt{shine@diku.dk}}

\title{
  \vspace{3cm}
  \Huge{Very Interesting Title} \\
  \Large{Somewhat Interesting Subtitle}
}

\date{June 6, 2013}

\begin{document}

\AddToShipoutPicture*{\put(0,0){\includegraphics*[viewport=0 0 700 600]{nat-farve}}}
\AddToShipoutPicture*{\put(0,602){\includegraphics*[viewport=0 600 700 1600]{nat-farve}}}
\AddToShipoutPicture*{\put(0,0){\includegraphics*{nat-en}}}

\clearpage\maketitle
\thispagestyle{empty}

\newpage

\end{document}