Modifié de https://tex.stackexchange.com/a/86392/36296 : 
     \documentclass[a5paper]{article}
    \usepackage{lipsum}   % To generate test text
    \usepackage{framed}
    \usepackage{ifthen}
    \usepackage{tikz}
    \usepackage[margin=1cm]{geometry}% for screen preview
    \usetikzlibrary{decorations.pathmorphing,calc,shadows.blur,shadings}
    
    \newcounter{mathseed}
    \setcounter{mathseed}{3}
    \pgfmathsetseed{\arabic{mathseed}} % To have predictable results
    % Define a background layer, in which the parchment shape is drawn
    \pgfdeclarelayer{background}
    \pgfsetlayers{background,main}
    
    % This is the base for the fractal decoration. It takes a random point between the start and end, and
    % raises it a random amount, thus transforming a segment into two, connected at that raised point
    % This decoration can be applied again to each one of the resulting segments and so on, in a similar
    % way of a Koch snowflake.
    \pgfdeclaredecoration{irregular fractal line}{init}
    {
      \state{init}[width=\pgfdecoratedinputsegmentremainingdistance]
      {
        \pgfpathlineto{\pgfpoint{random*\pgfdecoratedinputsegmentremainingdistance}{(random*\pgfdecorationsegmentamplitude-0.02)*\pgfdecoratedinputsegmentremainingdistance}}
        \pgfpathlineto{\pgfpoint{\pgfdecoratedinputsegmentremainingdistance}{0pt}}
      }
    }
    
    
    % define some styles
    \tikzset{
       paper/.style={draw=black!3, blur shadow, every shadow/.style={opacity=1, black},
                     lower left=black!10, upper left=black!5, upper right=white, lower right=black!5, paper/.style={draw=black, fill=none},
       irregular border/.style={decoration={irregular fractal line, amplitude=0.2},
               decorate,
         },
       ragged border/.style={ decoration={random steps, segment length=7mm, amplitude=2mm},
               decorate,
       }
    }
    
    \def\tornpaper#1{%
    \ifthenelse{\isodd{\value{mathseed}}}{%
    \tikz{
      \node[inner sep=1em,,minimum sep=1em,minimum width=\linewidth] (A) {#1};  % Draw the text of the node
      \begin{pgfonlayer}{background}  % Draw the shape behind
      \fill[paper] \draw[paper] % recursively decorate the bottom border
         \pgfextra{\pgfmathsetseed{\arabic{mathseed}}\addtocounter{mathseed}{1}}%
          {decorate[irregular border]{decorate{decorate{decorate{decorate[ragged border]{
            (A.north west) -- (A.north east)
          }}}}}}
          -- (A.south east)
         \pgfextra{\pgfmathsetseed{\arabic{mathseed}}}%
          {decorate[irregular border]{decorate{decorate{decorate{decorate[ragged border]{
          -- (A.south west)
          }}}}}}
          -- (A.north west);
      \end{pgfonlayer}}
    }{%
    \tikz{
      \node[inner sep=1em] (A) {#1};  % Draw the text of the node
      \begin{pgfonlayer}{background}  % Draw the shape behind
      \fill[paper] \draw[paper] % recursively decorate the bottom border
         \pgfextra{\pgfmathsetseed{\arabic{mathseed}}\addtocounter{mathseed}{1}}%
          {decorate[irregular border]{decorate{decorate{decorate{decorate[ragged border]{
            (A.north east) -- (A.north west)
          }}}}}}
          -- (A.south west)
         \pgfextra{\pgfmathsetseed{\arabic{mathseed}}}%
          {decorate[irregular border]{decorate{decorate{decorate{decorate[ragged border]{
          -- (A.south east)
          }}}}}}
          -- (A.north east);
      \end{pgfonlayer}}
    }}
    
    \begin{document}
    \noindent
    \tornpaper{
    {\Large Mon text en large} mon text
    }
    
    \end{document}\end{document}
![alt text][1]
  [1]: https://texnique.fr/osqa/upfiles/Screen_Shot_2019-06-20_at_00.36.25.png