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Even though the HMI application is a visual/graphic interface, you  you should not select the choose colors and or shapes simply to have a stylish , good looking display. The focus should be on facilitating project comprehension. 

There Below is a set of color conventions that are is recommended for HMI projects. . .

• Alarms: Use bright, intense colors that are not used in any other part of the the display.
• Background: Use non-saturated colors (e.g.: Light Gray) that have minimum interference with other colors.
• Static Equipment: Use the same color as Dark Gray or Black should be used for process lines. 
• Equipment State: The equipment state's color selection must depend on any additional appearance features, such as Fill, Shape and , or Text.
• Live Data: Use less intense, cool colors (e.g. dark blue and dark green). These colors should be easily distinguished from static information so they do not distract the operator

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