\documentclass{ppex}
\nonstopmode
\usepackage {pstcol,pst-3d}
\pagestyle{empty}

\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {pstcol,pst-3d}
\def\CubeSide#1#2#3#4{
\ThreeDput[normal=#1](#2){
\psframe*[linecolor=#3](4,4)
\rput(2,2){\footnotesize#4}}
}
\catcode`\<=12
\catcode`\>=12
\def\TheCube#1#2{%
\begin{pspicture}(-9,-7)(9,9)
\bfseries
\ifcase #1 \relax
\or %1
 \psset{viewpoint=-1 -1 #2}
 \rput[l](-8,-6){{\normalsize Viewpoint: -1 -1 #2}}
 \ifnum#2>0\ThreeDput[normal=0 0 1]{\psgrid(-3,-3)(6,6)}\fi
 \CubeSide{-1 0 0}{0,4,0}{yellow}{FRONT}
 \CubeSide{0 -1 0}{0,0,0}{blue}{FRONT}
\or %2
 \psset{viewpoint=1 -1 #2}
 \rput[l](-8,-6){{\normalsize Viewpoint: 1 -1 #2}}
 \ifnum#2>0\ThreeDput[normal=0 0 1]{\psgrid(-3,-3)(6,6)}\fi
 \CubeSide{0 -1 0}{0,0,0}{blue}{FRONT}
 \CubeSide{1 0 0}{4,0,0}{white}{BACK}
\or %3
 \psset{viewpoint=1 1 #2}
 \rput[l](-8,-6){{\normalsize Viewpoint: 1 1 #2}}
 \ifnum#2>0\ThreeDput[normal=0 0 1]{\psgrid(-3,-3)(6,6)}\fi
 \CubeSide{1 0 0}{4,0,0}{white}{BACK}
 \CubeSide{0 1 0}{4,4,0}{green}{BACK}
\or %4
 \psset{viewpoint=-1 1 #2}
 \rput[l](-8,-6){{\normalsize Viewpoint: -1 1 #2}}
 \ifnum#2>0\ThreeDput[normal=0 0 1]{\psgrid(-3,-3)(6,6)}\fi
 \CubeSide{0 1 0}{4,4,0}{green}{BACK}
 \CubeSide{-1 0 0}{0,4,0}{yellow}{FRONT}
\fi
\ifnum#2<0
 \CubeSide{0 0 -1}{0,4,0}{magenta}{BOT}
\else
 \CubeSide{0 0 1}{0,0,4}{red}{TOP}
\fi
\end{pspicture}
}
\psset{unit=.3cm,subgriddiv=0}
\begin{tabular}{cc}
\TheCube{1}{1}&
\TheCube{2}{1}\\[-10pt]
\TheCube{3}{1}&
\TheCube{4}{1}\\
\end{tabular}
\end{document}
