\documentclass[pstricks]{standalone}
\usepackage{pst-marble}
\begin{document}
\begin{pspicture}(-6,-6)(6,6)
  \psMarble[
    background={
      [ 118 118 118 ]
    },
    colors={
      [ 118 118 118 ]
    },
    viscosity=1000,
    oversample=2,
    actions={
      0 0 500 dup 0 colors 0 get 1.75 edgy-color 25 100 uniform-drops
      0 0 900 dup 0 [ colors 0 get 1.75 edgy-color ] 50 71 uniform-drops
      0 0 [ 50 150 250 350 450 550 650 ] 2 -90 70 stir
    }
  ](12,12)
\end{pspicture}
\end{document}
