Changing color of InteractiveMarker

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Does anyone know where the colors of the interactive marker (RGB and maybe the Cyan) could be changed? I've been searching through the source code, but I couldn't find a good reference. I think the Cyan color is coming from the interactive marker topics, but the rest, meaning the marker controls, I could not figure out. There are very few references to color in the interactive marker source code in RViz, so I suppose this is coming from some resource or mesh file.