Jason,
From the photos, I have no idea of what this might be. Photo 5 leads me to believe they are some kind of leaves. But photo 1 and 4 have me completely stumped.
Can you provide a little more info -- like what kind of texture do they have. How long have they been there? Could you get a photo of this stuff in your hand, or maybe on a paper plate so we can get a better idea of what it really looks like?
Regards,
Ken