If you are interested in trying this, these were all made by simply using black craft paper on a white sheet of typing paper. I'm sure this would be a fun craft to do with kids too. Just make the cut-outs from the black paper as mirror images or slide-outs and arrange them on the white paper to make interesting effects.
Glue the black paper cut-outs in place and there you have it, an interesting study in black on white. You could even try using colored papers too. Just let your imagination fly!