Prior the .NET Framework 3.5 SP1 was released, if you want to set alternate background colors for ListView rows you needed to write some kind Converter which returnes some kind of Brush. IF you have SP1 installed accomplishing the same functionality is rather trivial job. Here are the code snippets:

(defining the style)

    <Style x:Key="CustomListViewItemStyle" TargetType="{x:Type ListViewItem}">
        <Style.Triggers>
            <Trigger Property="ItemsControl.AlternationIndex" Value="0">
                <Setter Property="Background" Value="#2C2C2C"></Setter>
            </Trigger>
            <Trigger Property="ItemsControl.AlternationIndex" Value="1">
                <Setter Property="Background" Value="#262626"></Setter>
            </Trigger>
        </Style.Triggers>
    </Style>

(using the defined style)

    <ListView ItemContainerStyle="{DynamicResource CustomListViewItemStyle}"
              AlternationCount="2">
        ...
    </ListView>