documentclass{article}
usepackage{tikz}
usetikzlibrary{decorations.pathmorphing}

begin{document}
begin{tikzpicture}
  draw (0,0) rectangle (3,3);
  draw (1,1) rectangle (2,2);

  draw [olive,thick, decorate, decoration={random steps,segment
    length=5pt,amplitude=3pt}] (0.5,0) to (0.5,3);
  draw [olive,thick, decorate, decoration={random steps,segment
    length=5pt,amplitude=3pt}] (0,0.5) to (3,0.5);
  draw [olive,thick, decorate, decoration={random steps,segment
    length=5pt,amplitude=3pt}] (2.5,0) to (2.5,3);
  draw [olive,thick, decorate, decoration={random steps,segment
    length=5pt,amplitude=3pt}] (0,2.5) to (3,2.5);
end{tikzpicture}
end{document}