You can simply reference your vector graphics as StaticResources:
<Image Source="{StaticResource MyImage}" />
Store the images in a ResourceDictionary as DrawImage’s. Expression Blend can help you generate this stuff:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<DrawingImage x:Key="MyImage">
<DrawingImage.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="Black" Geometry="M 333.393,... 100.327 Z "/>
<GeometryDrawing Brush="Black" Geometry="F1 M 202.309,... Z "/>
:
</DrawingGroup.Children>
</DrawingGroup>
</DrawingImage.Drawing>
</DrawingImage>
</ResourceDictionary>