Power BI's visualizations have colors assigned automatically. It should be possible to set a color when a value is reached (e.g. always show negative bars in red) or for a particular color in a legen...
One of the biggest requests we currently get for our on-premise BI solution is that users want to be able to directly change the colors of specific items in a Power View report. (We have certain operational colors that are company standard and need to be enforced). Adding this in to Power BI would save me a ton of headaches explaining to engineers that 'No, we can't change a simple color for you'.
