A leaflet from a 1999 Crafts Council exhibition turned up recently - it mentioned a fingerprint rug by Ben Hall. Three cheers for the computer age - here it is on his website -
On his website he says "As a maker/designer I have always been attracted to salvage and re-using materials that may have outlived their original purpose in producing something new. " He enjoys the limitations and constraints of the medium. Do look at his website to see other hooked and proddy work.