SFlowGraphPinExec with Custom "PinColorModifier":

Source/Flow/Public/Nodes/FlowPin.h

@@ -30,6 +30,9 @@ struct FLOW_API FFlowPin
 	UPROPERTY(EditDefaultsOnly, Category = FlowPin)
 	FString PinToolTip;
 
+	UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "FlowPin")
+	FLinearColor PinColorModifier = FLinearColor::White;
+
 protected:
 	// PinType (implies PinCategory)
 	UPROPERTY(EditAnywhere, Category = FlowPin)

Source/FlowEditor/Private/Graph/FlowGraphPinFactory.cpp

@@ -29,7 +29,8 @@ TSharedPtr<SGraphPin> FFlowGraphPinFactory::CreatePin(UEdGraphPin* InPin) const
 	// Create the widget for a Flow 'Exec'-style pin
 	if (FlowGraphNode && FFlowPin::IsExecPinCategory(InPin->PinType.PinCategory))
 	{
-		const TSharedPtr<SGraphPin> NewPinWidget = SNew(SFlowGraphPinExec, InPin);
+		const TSharedPtr<SGraphPin> NewPinWidget = SNew(SFlowGraphPinExec, InPin)
+														.PinModifierColor(FlowGraphNode->GetPinModifierColor(InPin));
 
 		const UFlowNode* FlowNode = Cast<UFlowNode>(FlowGraphNode->GetFlowNodeBase());
 

Source/FlowEditor/Private/Graph/Nodes/FlowGraphNode.cpp

@@ -339,11 +339,13 @@ void UFlowGraphNode::AllocateDefaultPins()
 		for (const FFlowPin& InputPin : FlowNode->InputPins)
 		{
 			CreateInputPin(InputPin);
+			PinColorModifierMap.Add(InputPin.PinName, InputPin.PinColorModifier);
 		}
 
 		for (const FFlowPin& OutputPin : FlowNode->OutputPins)
 		{
 			CreateOutputPin(OutputPin);
+			PinColorModifierMap.Add(OutputPin.PinName, OutputPin.PinColorModifier);
 		}
 	}
 }
@@ -945,6 +947,11 @@ void UFlowGraphNode::AddUserOutput()
 	AddInstancePin(EGPD_Output, FlowNode->CountNumberedOutputs());
 }
 
+FLinearColor UFlowGraphNode::GetPinModifierColor(const UEdGraphPin* Pin) const
+{
+	return PinColorModifierMap.FindRef(Pin->PinName, FColor::White);
+}
+
 void UFlowGraphNode::AddInstancePin(const EEdGraphPinDirection Direction, const uint8 NumberedPinsAmount)
 {
 	const FScopedTransaction Transaction(LOCTEXT("AddInstancePin", "Add Instance Pin"));

Source/FlowEditor/Private/Graph/Widgets/SFlowGraphNode.cpp

@@ -45,6 +45,7 @@ void SFlowGraphPinExec::Construct(const FArguments& InArgs, UEdGraphPin* InPin)
 {
 	SGraphPinExec::Construct(SGraphPinExec::FArguments(), InPin);
 	bUsePinColorForText = true;
+	PinColorModifier = InArgs._PinModifierColor;
 }
 
 const FLinearColor SFlowGraphNode::UnselectedNodeTint = FLinearColor(1.0f, 1.0f, 1.0f, 0.5f);

Source/FlowEditor/Public/Graph/Nodes/FlowGraphNode.h

@@ -192,6 +192,8 @@ class FLOWEDITOR_API UFlowGraphNode : public UEdGraphNode
 	void AddUserInput();
 	void AddUserOutput();
 
+	FLinearColor GetPinModifierColor(const UEdGraphPin* Pin) const;
+
 	// Add pin only on this instance of node, under default pins
 	void AddInstancePin(const EEdGraphPinDirection Direction, const uint8 NumberedPinsAmount);
 
@@ -344,6 +346,10 @@ class FLOWEDITOR_API UFlowGraphNode : public UEdGraphNode
 	UPROPERTY()
 	FString ErrorMessage;
 
+protected:
+	UPROPERTY()
+	TMap<FName, FLinearColor> PinColorModifierMap;
+
 private:
 	/** parent UFlowGraphNode for this node, 
 	  * note, this is not saved, and is restored in when the graph is opened in the editor via 

Source/FlowEditor/Public/Graph/Widgets/SFlowGraphNode.h

@@ -12,7 +12,10 @@ class FLOWEDITOR_API SFlowGraphPinExec : public SGraphPinExec
 public:
 	SFlowGraphPinExec();
 
-	SLATE_BEGIN_ARGS(SFlowGraphPinExec) {}
+	SLATE_BEGIN_ARGS(SFlowGraphPinExec) :
+		_PinModifierColor(FLinearColor::White)
+		{} 
+		SLATE_ARGUMENT(FLinearColor, PinModifierColor)
 	SLATE_END_ARGS()
 
 	void Construct(const FArguments& InArgs, UEdGraphPin* InPin);