\documentclass[]{article}
\usepackage{pstricks}
\usepackage{pst-blur}
\pagestyle{empty}
\parindent=0pt

\begin{document}

\begin{center}
\begin{pspicture}(8,8)
  \psset{shadow=true,blur=true,shadowsize=10pt,%
     blurradius=5pt,linestyle=none,linecolor=lightgray}
  \psframe[shadow=false](4,4)
  \pscircle[linestyle=solid](1.6,2.4){1.5}
  \psframe*[shadow=false](0,4)(4,8)
  \pscircle[linestyle=solid,fillcolor=yellow,blurbg=lightgray](1.6,6.4){1.5}
  \psframe*[linecolor=red,shadow=false](4,0)(8,4)
  \pscircle[linestyle=solid,fillcolor=blue,blurbg=red](5.6,2.4){1.5}
  \psframe*[linecolor=cyan,shadow=false](4,4)(8,8)
  \pscircle[linestyle=solid,fillcolor=magenta,blurbg=cyan](5.6,6.4){1.5}
\end{pspicture}
\end{center}

\end{document}
