Nook Background Images 2

Here's my second (and larger) pack of images for use with the Barnes & Noble Nook. Each image is 16 shades of grayscale, so it should render quickly on the Nook.

After seeing the screen, I thought that more high contrast line drawing type images could make a much better screensaver than my photographs, so here's a collection of 20.

Note: Updated to remove black borders