Re: simboli colorati

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oppure meglio usa pstricks / pst-fill per generare triangoli e altro a colori
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prova cosi:

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\usepackage{pst-fill}
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\begin{pspicture}(2,0.5)
\psframe[linestyle=none,fillstyle=solid,fillcolor=yellow](0.5,0)(1.0,0.5)
\pstriangle[linecolor=red,fillstyle=solid,fillcolor=cyan](1.5,0)(0.5,0.5)
\pstriangle*[linecolor=red](1.5,0.7)(0.5,0.5)
\pscircle*(-1,-0.5){0.4}
\pscircle[fillstyle=solid,fillcolor=green](2,0.5){0.4}
\pspolygon[linecolor=blue](0,1)(1,4)(4,6)(4,0)(2,1)
\end{pspicture}%

Attenzione però non va con pdfLaTeX

sebasch