\usepackage {pstcol}
\definecolor{lightblue}{rgb}{.68, .85, .9}
\begin{pspicture}(0,0)(3,2)\showgrid
  \pscircle[linewidth=1mm,linecolor=green]
           (1,1){1}
  \pscircle[linestyle=none,fillstyle=solid,
            fillcolor=lightblue](1,1){0.5}
  \pscircle[fillstyle=crosshatch](2.5,1.5)
           {0.5}
\end{pspicture}
