Can You Tell What These Are???

To me, they look like earth's crust, or another planet, or the moon, or volcanic something-or-other, or something from Yellowstone... Can you guess what they are from? (Answer at the bottom of the post! ;0) )

Have you figured it out? Here are two more that might make it more obvious:

Now have you figured it out? ;0)

I took these off the rust and ink-stained floor of an industrial building I visited tonight that used to house a newspaper business! You should have seen the looks I was getting, what with my knee down in the old ink and all... ;0) I just thought it was too cool to pass up!