Ever since I found WinDirStat, the best tool for finding large files on your hard disk and cleaning up data, Treemaps and Heatmaps have been of interest.
Here is one way to replicate this functionality in Reporting Services.
I generated the colors by finding the darkest acceptable color (not quite red) that black text was still readable on top of, then creating a gradient using Paint.NET fading from this color to white, then finally using a "pixelate" effect in Paint.NET to remove the gradient smoothness and get definite colors. I'm sure you can think of better ways to do this!
Source: Thomas Williams :
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