Personally, if you're talking about using it in multiple places without having to re-use / re-draw your xaml paths each time. Then I just plop them in a ContentControl like;
<!-- Plop this in your resource dictionary or your resource declaration -->
<Style x:Key="TheAwesomeXAMLimage" TargetType="ContentControl">
<!-- Add additional Setters Here -->
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentControl">
<!-- Just Paste your XAML here -->
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Now actually place it on your view -->
<ContentControl Style="{StaticResource TheAwesomeXAMLimage}"/>
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