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

\begin{document}

\begin{center}
\bgroup
\begin{pspicture}(5.5,2.5)
  \psframe[fillstyle=ccslope](2.5,2.5)
  \psframe[fillstyle=ccslopes](3,0)(5.5,2.5)
\end{pspicture}
\begin{pspicture}(5.5,2.5)
  \psframe[fillstyle=radslope](2.5,2.5)
  \psframe[fillstyle=radslopes](3,0)(5.5,2.5)
\end{pspicture}

\begin{pspicture}(0,-0.25)(\linewidth,0.75cm)
\psaxes[axesstyle=frame,tickstyle=bottom](\linewidth,0.5cm)
\psframe[fillstyle=slopes](\linewidth,0.5cm)
\end{pspicture}
\egroup
\end{center}


\end{document}
