Place quotation (dictum) in a box

Question

Background

Looking to change the appearance of quotations at the start of each Chapter (or Part). The book is using KOMA Script v2. (Most searches for the quote command come back with results for typesetting quotation marks, rather than aphorisms.)

Problem

Currently, the quotation resembles:

Am looking for something similar to:

Good code is short, simple, and symmetrical -- the challenge is figuring out how to get there. ~Sean Parent

(A double line border, a background colour, but using a serif font with the author name right-justified.)

Source Code

The quotation is defined as follows:

\setchapterpreamble{\dictum[Sean Parent]{Good code...}}

I have altered the style of the dictum settings as follows:

\renewcommand*{\dictumwidth}{.75\textwidth}
\renewcommand*{\dictumauthorformat}[1]{\textsc{#1}\bigskip}

Questions

• What packages allow such fine control over quotations (or quotes)? (Neither fncychap nor quotchap offer sufficient sophistication.)
• How can the aphorism be placed in a \colorbox? (Using \dictumtext?)
• What is a good way to add double lines to the box?

Related

• Suggestions on how to place a sentence of text inside a box with a border around it

Answer 1

I did not use epigraph. I wrote my own version:

\usepackage{times}

\definecolor{quotationcolour}{HTML}{F0F0F0}
\definecolor{quotationmarkcolour}{HTML}{1F3F81}

% Double-line for start and end of epigraph.
\newcommand{\epiline}{\hrule \vskip -.2em \hrule}
% Massively humongous opening quotation mark.
\newcommand{\hugequote}{%
  \fontsize{42}{48}\selectfont \color{quotationmarkcolour} \textbf{``}
  \vskip -.5em
}

% Beautify quotations.
\newcommand{\epigraph}[2]{%
  \bigskip
  \begin{flushright}
  \colorbox{quotationcolour}{%
    \parbox{.60\textwidth}{%
    \epiline \vskip 1em {\hugequote} \vskip -.5em
    \parindent 2.2em
    #1\begin{flushright}\textsc{#2}\end{flushright}
    \epiline
    }
  }
  \end{flushright}
  \bigskip
}

The result:

Suggestions for improvement are welcome.

Answer 2

One package worth looking at is epigraph, which includes a few options for setting this sort of thing.