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\documentclass[a4paper,10pt]{article}
\usepackage[dvipsnames]{pstricks}
\usepackage{pst-xkey}
\makeatletter
\define@key[psset]{}{stain}{\def\psk@stain{#1}}
\define@key[psset]{}{step}{\def\psk@step{#1}}
\psset{stain=20,step=0.25}%
%
\def\psCStain{\pst@object{psCStain}}
\def\psCStain@i(#1)#2{%
\leavevmode
\pst@killglue
\begingroup
\use@par
\pscircle*(#1){#2}
\init@pscode%
\pst@getcoor{#1}\pst@tempa%
\pssetlength\pst@dimc{#2}%
\def\pst@linetype{4}%
\addto@pscode{%
rrand srand
/getRandInt { rand 2147483647 div \psk@stain\space mul } def
\pst@tempa\space translate
/radius \pst@number\pst@dimc \psk@dimen CLW mul sub def
newpath
0 radius moveto
0 \psk@step\space 360 {
/angle exch def
radius getRandInt add dup angle cos mul exch angle sin mul
lineto
} for
closepath fill
}%
\pst@stroke
\use@pscode
\endgroup
\ignorespaces%
}
\makeatother
\pagestyle{empty}
\parindent=0pt
\begin{document}
\begin{pspicture}(7,2)
\psCStain[linecolor=red](3.5,1){0.5}
\psCStain(1,1){0.25}
\psCStain[linecolor=Goldenrod,step=1](6,1){0.25}
\end{pspicture}
\end{document}
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