drawing tree canopy in latex

Question

Is it possible to draw a tree canopy in latex, perhaps with tikz. An example:

So, on the left of this image you will see a bunch of trees, can these be re-created with tikz?

Answer 1

No time now for details, perhaps later. This is an idea:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\thispagestyle{empty}
\usetikzlibrary{decorations.pathmorphing,shapes}
\tikzset{
  treetop/.style = {
    decoration={random steps, segment length=0.4mm},
    decorate
  },
  trunk/.style = {
    decoration={random steps, segment length=2mm, amplitude=0.2mm},
    decorate
  }
}

\begin{tikzpicture}
\foreach \w/\f in {0.3/30,0.2/50,0.1/70} {
  \fill [brown!\f!black, trunk] (0,0) ++(-\w/2,0) rectangle +(\w,-3);
}
\foreach \n/\f in {1.4/40,1.2/50,1/60,0.8/70,0.6/80,0.4/90} {
   \fill [green!\f!black, treetop] ellipse (\n/1.5 and \n);
}
\end{tikzpicture}
\end{document}