Hi,@IKINGSHADOW . Welcome Microsoft Q&A.
You could try to refer to the example below and see if it helps you.
Xaml:
<Window.Resources>
<local:StringToImageConverter x:Key="StringToImageConverter" />
</Window.Resources>
<Grid>
<Grid.Background>
<ImageBrush ImageSource="{Binding ElementName=lb,Path=SelectedItem.Name, Converter={StaticResource StringToImageConverter}}"/>
</Grid.Background>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="60"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<ListView HorizontalAlignment="Left" x:Name="lb" Width="50" Height="100" ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" >
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel >
<Image Width="30" Source="{Binding Name, Converter={StaticResource StringToImageConverter}}" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Image Grid.Column="1" Width="100" Height=" 100" VerticalAlignment="Bottom" Margin="20"
Source="{Binding ElementName=lb,Path=SelectedItem.Name, Converter={StaticResource StringToImageConverter}}"/>
</Grid>
Codebehind:
212350-new-text-document-2.txt
The result:

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