\documentclass{standalone}

\usepackage{tikz}
\usepackage{shapes}

\begin{document}
\begin{tikzpicture}
  \grid{16}{16}{(-8,-8)}

  \square{yellow}{(2,2)}
  \square{yellow}{(-2,2)}
  \square{green}{(0,-3)}
  \square{green}{(3,-1)}
  \square{green}{(-3,-1)}

  \disk{cyan}{(0,0)}

  \disk{magenta}{(0,5)}
  \disk{magenta}{(5,1)}
  \disk{magenta}{(-5,1)}
  \disk{magenta}{(3,-4)}
  \disk{magenta}{(-3,-4)}

\end{tikzpicture}
\end{document}