Add project files.

Nodify/Themes/Styles/ItemContainer.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:local="clr-namespace:Nodify">
+
+    <SolidColorBrush x:Key="ItemContainer.HighlightColor"
+                     Color="DodgerBlue" />
+
+    <DrawingBrush x:Key="ItemContainer.HighlightBrush"
+                  Viewport="0 0 24 24"
+                  ViewportUnits="Absolute"
+                  TileMode="Tile">
+        <DrawingBrush.Drawing>
+            <DrawingGroup>
+                <GeometryDrawing Brush="{StaticResource ItemContainer.HighlightColor}">
+                    <GeometryDrawing.Geometry>
+                        <GeometryGroup>
+                            <RectangleGeometry Rect="0 0 50 50" />
+                            <RectangleGeometry Rect="50 50 50 50" />
+                        </GeometryGroup>
+                    </GeometryDrawing.Geometry>
+                </GeometryDrawing>
+            </DrawingGroup>
+        </DrawingBrush.Drawing>
+    </DrawingBrush>
+
+    <Style TargetType="{x:Type local:ItemContainer}">
+        <Setter Property="BorderThickness"
+                Value="1" />
+        <Setter Property="SelectedBorderThickness"
+                Value="2" />
+        <Setter Property="BorderBrush"
+                Value="DodgerBlue" />
+        <Setter Property="SelectedBrush"
+                Value="Orange" />
+        <Setter Property="HighlightBrush"
+                Value="{StaticResource ItemContainer.HighlightBrush}" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type local:ItemContainer}">
+                    <Border Background="{TemplateBinding Background}"
+                            BorderThickness="{TemplateBinding BorderThickness}"
+                            BorderBrush="{TemplateBinding BorderBrush}"
+                            Padding="{TemplateBinding Padding}"
+                            x:Name="Border"
+                            CornerRadius="3">
+                        <ContentPresenter />
+                    </Border>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+        <Style.Triggers>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsSelected"
+                               Value="True" />
+                    <Condition Property="IsPreviewingSelection"
+                               Value="{x:Null}" />
+                </MultiTrigger.Conditions>
+                <MultiTrigger.Setters>
+                    <Setter Property="BorderBrush"
+                            Value="{Binding SelectedBrush, RelativeSource={RelativeSource Self}}" />
+                    <Setter Property="Margin"
+                            Value="{Binding SelectedMargin, RelativeSource={RelativeSource Self}}" />
+                    <Setter Property="BorderThickness"
+                            Value="{Binding SelectedBorderThickness, RelativeSource={RelativeSource Self}}" />
+                </MultiTrigger.Setters>
+            </MultiTrigger>
+            <Trigger Property="IsPreviewingSelection"
+                     Value="True">
+                <Setter Property="BorderBrush"
+                        Value="{Binding SelectedBrush, RelativeSource={RelativeSource Self}}" />
+                <Setter Property="Margin"
+                        Value="{Binding SelectedMargin, RelativeSource={RelativeSource Self}}" />
+                <Setter Property="BorderThickness"
+                        Value="{Binding SelectedBorderThickness, RelativeSource={RelativeSource Self}}" />
+            </Trigger>
+            <Trigger Property="local:PendingConnection.IsOverElement"
+                     Value="True">
+                <Setter Property="BorderBrush"
+                        Value="{Binding HighlightBrush, RelativeSource={RelativeSource Self}}" />
+                <Setter Property="Margin"
+                        Value="{Binding SelectedMargin, RelativeSource={RelativeSource Self}}" />
+                <Setter Property="BorderThickness"
+                        Value="{Binding SelectedBorderThickness, RelativeSource={RelativeSource Self}}" />
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+
+</ResourceDictionary>