I started with a drawing of a street in Trastevere in Rome. I indented the drawing onto an A4 sheet of styrofoam, inked it, and then printed it by hand. I first printed the block in black; the lines that I indented onto the block appear as white.
Then I printed the block in white ink onto black paper, so this time the lines that I indented show as positive marks.
The ink is a bit blotchy in places where I applied too much.
A quick way of adding colour is to print onto coloured paper. Here's the block again, printed on red paper.
Finally, I cut away some of the block where I wanted bigger light areas, and printed it in warm brown sienna onto light brown pastel paper.