Without redundant code:<p><pre><code>  \documentclass[border=3pt]{standalone}
  \usepackage{tikz}
  \usetikzlibrary{lindenmayersystems}
  \begin{document}
  \begin{tikzpicture}[line width=1pt, rounded corners=4pt,
          l-system={
              rule set={X -&gt; X+YF+,Y-&gt;-FX-Y},
              axiom=FX, angle=90, order=11, step=10pt
          }
      ]
  \foreach \c&#x2F;\r in {green&#x2F;0, red&#x2F;90, blue&#x2F;180, orange&#x2F;270}
      \draw[\c, rotate=\r] l-system;
  \end{tikzpicture}
  \end{document}</code></pre>