The following example demonstrates how to provide an empty-surface brush, which will be applied to all cards that do not display a surface.

XAML
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<Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid">
  <Grid.Resources>
   <xcdg:DataGridCollectionViewSource x:Key="cvs_employees"
                                      Source="{Binding Source={x:Static Application.Current}, Path=EmployeesTable}"/>
 
     <LinearGradientBrush x:Key="emptySurfaceBrush"
                          StartPoint="0.5,1"
                          EndPoint="0.5,0">
        <GradientStop Offset="0" Color="#FF0E0E0E"/>
        <GradientStop Offset="0.33" Color="#FF323232"/>
        <GradientStop Offset="0.63" Color="#FF4C4C4C"/>
        <GradientStop Offset="1" Color="#FF949494"/>
     </LinearGradientBrush>
  </Grid.Resources>
 
  <xcdg:DataGridControl x:Name="EmployeesGrid"
                      ItemsSource="{Binding Source={StaticResource cvs_employees}}">
   <xcdg:DataGridControl.Columns>
      <xcdg:Column FieldName="LastName"
                   IsMainColumn="True"/>
   </xcdg:DataGridControl.Columns>
   <xcdg:DataGridControl.View>      
     <xcdg:CardflowView3D SideCardsCount="1"
                          EmptySurfaceBrush="{StaticResource emptySurfaceBrush}">
         <xcdg:CardflowView3D.Theme>
            <xcdg:ElementalBlackTheme/>
         </xcdg:CardflowView3D.Theme>
      </xcdg:CardflowView3D>
   </xcdg:DataGridControl.View>
  </xcdg:DataGridControl>
</Grid>
VB.NET
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Dim brush As New LinearGradientBrush()
brush.GradientStops.Add( New GradientStop( Color.FromArgb( 255, 14, 14, 14 ), 0 ) )
brush.GradientStops.Add( New GradientStop( Color.FromArgb( 255, 50, 50, 50 ), 0.33 ) )
brush.GradientStops.Add( New GradientStop( Color.FromArgb( 255, 76, 76, 76 ), 0.63 ) )
brush.GradientStops.Add( New GradientStop( Color.FromArgb( 255, 148, 148, 148 ), 1 ) )
dataGridControl.Columns( "LastName" ).IsMainColumn = True
Dim view As New CardflowView3D()
view.SideCardsCount = 1
view.EmptySurfaceBrush = brush
view.Theme = New ElementalBlackTheme()
dataGridControl.View = view
C#
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LinearGradientBrush brush = new LinearGradientBrush();
brush.GradientStops.Add( new GradientStop( Color.FromArgb( 255, 14, 14, 14 ), 0 ) );
brush.GradientStops.Add( new GradientStop( Color.FromArgb( 255, 50, 50, 50 ), 0.33 ) );
brush.GradientStops.Add( new GradientStop( Color.FromArgb( 255, 76, 76, 76 ), 0.63 ) );
brush.GradientStops.Add( new GradientStop( Color.FromArgb( 255, 148, 148, 148 ), 1 ) );
dataGridControl.Columns[ "LastName" ].IsMainColumn = true;
CardflowView3D view = new CardflowView3D();
view.SideCardsCount = 1;
view.EmptySurfaceBrush = brush;
view.Theme = new ElementalBlackTheme();
dataGridControl.View = view;