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Color-Scheme Library
Mathematica 6 has a carefully designed color library that can immediately be applied to any form of visualization.
In[1]:=

Click for copyable input
GraphicsGrid[

 Partition[

  Plot3D[Sin[x + Cos[y]], {x, -3, 5}, {y, 0, 5}, Mesh -> None, 

     Axes -> None, ColorFunction -> #] & /@ 

   Take[ColorData["Gradients"], 16], 4]]
Out[1]=