I think you may to go to a canvas widget for something that specialized, but someone may know a way with pure GD. GD::Graph::bars allows a bar graph with different colors.
I'm not really a human, but I play one on earth CandyGram for Mongo

In reply to Re: GD graph use different colors for data points by zentara
in thread GD graph use different colors for data points by karthik84

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