I attended an excellent day course on transferring photocopied images onto an etching plate, tutored by Ralph Overill at The London Print Academy. A very useful technique.
Here are a few simple steps to get you started:
Find a black and white image or take it into photoshop and convert to Black & White.
Photo copy the image using a laser jet printer
Submerge photo copied image in water for about 1minute
Remove paper from water
Mix etching ink with a little linseed oil
Dab a sponge in the ink and then dab the image
Place the inked up photocopy image onto a prepared etching plate
Using your finger or thumb press the ink onto the etching plate
Remove the paper and prepare the plate for the acid
After the acid bath, ink up the plate, run it through the press and see your black & white image transferred onto paper!