Discovered this source royalty free stock photos, Public Domain Pictures. After a quick look, I found several photos I thought I could use in presentations or for the blog. The authors only ask that you credit them.
Month or so ago I was searching for a free picture of a gravestone. This image from their collection would have met my needs perfectly. There is a wide variety of pictures. Weakest selection seems to be of people but still worth keeping the link. They have a nice selection of shots with a white background. Perfect for those Photoshop composites.
[Image: Petr Kratochvil; "Painting with light on cemetery"; Public Domain Pictures.net; http://www.publicdomainpictures.net/view-image.php?image=122]