[Tex/LaTex] Showcase of beautiful invitations in TeX

Question

I'm interested in using TeX and friends to produce beautifully typeset invitations (for parties, weddings, and especially thesis defences). I understand that there is a package gcard for making folded greeting cards, but it's fairly simple. I would love to see a list of, or links to, more sophisticated-looking examples for inspiration and motivation. (If the complete source code is freely available and adaptable, so much the better.)

Answer 1

I made an invitation using Xe/LuaLaTeX and a TikZ fading over an OpenStreetMap generated map excerpt. Here is a link to the map I used (I don't know how long it is valid).

\documentclass{article}
\pagestyle{empty}
\usepackage{geometry,fontspec,tikz}
\geometry{a6paper,landscape,hmargin={1cm,1cm},vmargin={1cm,1cm}}
\setmainfont[Ligatures=TeX]{Adobe Garamond Pro}
\usetikzlibrary{fadings}
\tikzfading[name=fade right,
left color=transparent!0,
right color=transparent!100]
\setlength\parindent{0pt}
\begin{document}
\begin{tikzpicture}[overlay,remember picture]
  \node[anchor=east,inner sep=0pt] (pic) at (current page.east)
    {\includegraphics[height=\pdfpageheight]{map}};
  \fill[white,path fading=fade right] (pic.north west) rectangle (pic.south east);
  \coordinate (pin) at (12,-2.5);
  \filldraw[ultra thick,draw=red,fill=red!50] (pin) -- ++(70:.5) arc (-20:200:.18) -- cycle;
  \path (pin) -- ++(0,.5) node[draw,fill,red,circle,inner sep=1pt] {};
\end{tikzpicture}%
\obeylines%
{\addfontfeatures{Scale=3,LetterSpace=10} INVITATION}

\bigbreak
\textit{%
  Dear friend,

  I'd love to invite you to my party.

  Sincerly, your friend.
}

\vfill

{\addfontfeatures{Scale=1.4,LetterSpace=5}\scshape when?}
\textit{%
  December 24\/\rlap{,}\textsuperscript{th} 2015
  8\kern.5pt:\kern.5pt30 pm
}
\medbreak
{\addfontfeatures{Scale=1.4,LetterSpace=5}\scshape where?}
\textit{%
  Times Square,
  London E1,
  UK
}
\end{document}