Showcase of beautiful chapter designs

Question

I'm currently writing a book, and I was wondering if you guys could display your chapter designs:

• Complex - have different formatting
• Beautiful and awesome
• With the tex source code
• Nothing original. Something you've made/customized

I have seen the chapters from the memoir class, but I would like something that's custom-made and not from a class.

I think this would be very motivational and inspiring stuff!

Here's my chapter design:

\documentclass[headinclude,footinclude,openany]{scrbook}
\usepackage[eulerchapternumbers,pdfspacing]{classicthesis}
\usepackage{arsclassica}
\usepackage{changepage}

\strictpagecheck

\titleformat{\chapter}[block]%
        {\normalfont\Large\sffamily}%
        {{\color{halfgray}\chapterNumber\thechapter%
        \hspace{10pt}\vline}  }{10pt}%
        {\spacedallcaps}[\chapterdecoration]

\definecolor{halfgray}{gray}{0.55}

\newcommand\anglei{-45}
\newcommand\angleii{45}
\newcommand\angleiii{225}
\newcommand\angleiv{135}

\newcommand\chapterdecoration{%
\begin{tikzpicture}[remember picture,overlay,shorten >= -10pt]
\coordinate (aux1) at ([yshift=-15pt]current page.north east);
\coordinate (aux2) at ([yshift=-410pt]current page.north east);
\coordinate (aux3) at ([xshift=-4.5cm]current page.north east);
\coordinate (aux4) at ([yshift=-150pt]current page.north east);
\checkoddpage
\ifoddpage
\else
\coordinate (aux1) at ([yshift=-15pt]current page.north west);
\coordinate (aux2) at ([yshift=-410pt]current page.north west);
\coordinate (aux3) at ([xshift=4.5cm]current page.north west);
\coordinate (aux4) at ([yshift=-150pt]current page.north west);
\renewcommand\anglei{-135}
\renewcommand\angleii{135}
\renewcommand\angleiii{-45}
\renewcommand\angleiv{45}
\fi
\begin{scope}[halfgray!40,line width=12pt,rounded corners=12pt]
\draw
  (aux1) -- coordinate (a)
  ++(\angleiii:5) --
  ++(\anglei:5.1) coordinate (b);
\draw[shorten <= -10pt]
  (aux3) --
  (a) --
  (aux1);
\draw[opacity=0.6,halfgray,shorten <= -10pt]
  (b) --
  ++(\angleiii:2.2) --
  ++(\anglei:2.2);
\end{scope}
\draw[halfgray,line width=8pt,rounded corners=8pt,shorten <= -10pt]
  (aux4) --
  ++(\angleiii:0.8) --
  ++(\anglei:0.8);
\begin{scope}[halfgray!70,line width=6pt,rounded corners=8pt]
\draw[shorten <= -10pt]
  (aux2) --
  ++(\angleiii:3) coordinate[pos=0.45] (c) --
  ++(\anglei:3.1);
\draw
  (aux2) --
  (c) --
  ++(\angleiv:2.5) --
  ++(\angleii:2.5) --
  ++(\anglei:2.5) coordinate[pos=0.3] (d);   
\draw 
  (d) -- +(\angleii:1);
\end{scope}
\end{tikzpicture}%
}

\begin{document}
  \mbox{}\newpage
  \mbox{}\newpage

  \chapter{Part 1: Introduction}
  \label{chap:part_1_introduction}
  
  \lipsum[1-4]
  
  % chapter part_1_introduction (end)
  
  \newpage

  \chapter{Part 2: Outline of this Book}
  \label{chap:part_2_outline_of_this_book}
  
  \lipsum[1-4]
  
  % chapter part_2_outline_of_this_book (end)
  
  \newpage
\end{document}

which makes this: