With the first one, I carved on Fun Foam:
I kept a center design, as you can see, in the upper left corner, so when I stamped the image, I would have a point to work from.
Here is how the stamp looks when printed:
I did not get the imaged quite evenly, but you can see how the line down the middle of the stamp, created a square. I used Speedball, metallic white, block printing ink on black cardstock. I might go in with a white metallic pen to fill in more details, or I may leave it the way it is. Have not decided yet.
The second carving, I did on Styrofoam:
I stained the Styrofoam with black ink, otherwise you would not be able to see the image.
Here is what this carving looks like when printed:
I used Speedball black block printing ink for this image. To me, this looks like vines growing out from a brick wall. I really like how the black ink makes this carving pop.
As you can see, you don't need a printing machine and printing blocks to do mono-printing. Styro and Fun Foams work just as well.