UserProfilePictureControl.xaml

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<UserControl
    x:Class="PhotoSharingApp.Universal.Controls.UserProfilePictureControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:PhotoSharingApp.Universal.Controls"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:valueConverters="using:PhotoSharingApp.Universal.ValueConverters"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">

    <UserControl.Resources>
        <valueConverters:NullToVisibilityConverter x:Key="NullToVisibilityConverter" />
        <valueConverters:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
    </UserControl.Resources>

    <Grid x:Name="layoutRoot">
        <!--The real profile picture-->
        <Ellipse Fill="White" Visibility="{Binding Path=ShowBorder, Converter={StaticResource BooleanToVisibilityConverter}}" />

        <Ellipse Margin="4" Visibility="{Binding Path=Source, Converter={StaticResource NullToVisibilityConverter}}">
            <Ellipse.Fill>
                <ImageBrush ImageSource="{Binding Path=Source}" />
            </Ellipse.Fill>
        </Ellipse>

        <!--The placeholder profile picture-->
        <Grid Visibility="{Binding Path=Source, Converter={StaticResource NullToVisibilityConverter}, 
                                                ConverterParameter=True}">
            <Ellipse Fill="{ThemeResource ApplicationPageBackgroundThemeBrush}" />
            <Viewbox Width="30">
                <SymbolIcon Symbol="Contact" />
            </Viewbox>
        </Grid>
    </Grid>
</UserControl>