@DavidHourani you can choose between
low, guarded, elevated, high, severe or direct color names like green, blue, yellow, orange, red
| eval range=case(your_field_name==your_field_value1, "severe", your_field_name==your_field_value2,"high",your_field_name==your_field_value3,"low",true(),"low")
Read the following documentation, also make sure no-one edits the UI configuration for the Single Value panel: http://docs.splunk.com/Documentation/Splunk/latest/Viz/SingleValueFormatting#Migration_for_rangemap_settings_in_existing_single_value_visualizations
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