Here is my little contribution to this great engine.
I have created a small sample that uses Silverlight and images as polygons.
You can access the sample
When I started with Farseer this was the first thing I wanted to do but I had problems figuring out how to use custom images.
Hope that you find it useful and if you have questions suggestions please let me know.
I use a similar technique for my current games
http://www.casualgames.nu/AsteroidLander.aspx and the latest project
http://www.casualgames.nu/AsteroidCommand.aspx also uses WriteableBitmapEx to get blending support. And with the sample above its very easy to add.