Hi,
Ed Ferrero has a vba example. It's for a column chart but the code will
be very similar. Instead of interior fill you will be doing marker stuff.
eg:
.MarkerBackgroundColorIndex = 50
.MarkerForegroundColorIndex = 50
Conditional Chart Formatting example.
http://www.edferrero.com/charting.aspx
Cheers
Andy
> I need to format my charts so the color of the data points change depending
> on the value amount. My tabels are already set up and cannot be change or
> have anything new added due to the amount and delicacy of data. Is there a
> macro I can use. Perhaps a formula I can put somewhere?

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Andy Pope, Microsoft MVP - Excel
http://www.andypope.info