public GraphDisplayOptionsBuilder defaultVertexColor(Color c) {
		displayOptions.setDefaultVertexColor(c);
		return this;
	}
Sets the default vertex color for vertexes that don't have a registered vertex type
@param c the default vertex color
@return this GraphDisplayOptionsBuilder
Ghidra/Framework/Graph/src/main/java/ghidra/service/graph/GraphDisplayOptionsBuilder.java