Sorry for slow response on this one @philipbaileynar. In answer to:
How about 'Graphical Summary' and put it right of 'Graphical Results by Category' tab.
What I originally had in mind is below, but I think is too complicated. As you can see, I have six pie charts: Total Areal Change by category, Total Areal Surface Lowering by relevant categories), Total Areal Surface Raising by relevant categories). Then same for volumetric. The lowering vs. raising battles are way more interesting, but hard.
Well, I don't know that we can worry too much about color scheme, just show whatever legend is used. This is unlikely to be something folks use for graphic presentation without the more complicated (and out of scope) color picker I show above. For now, anything is icing on the cake. Plus, with the spreadsheet, they can make their own.
Questions for @joewheaton regarding the new budget segregation piece charts (see screenshot below)