Splunk UI has a number of features that allow the administrator to make the reports more presentable. One such feature that proves to be very useful for presenting distinguished results is the custom colors. For example, if the sales of a product drop below a threshold value, then as an administrator you can set the chart to display the values in red color.
The administrator can also change chart colors in the Splunk Web UI by editing the panels from the panel settings mentioned above the dashboard. Moreover, you can write the codes and use hexadecimal values to choose a color from the palette.