I know of wood floors, brick floors, and tile floors, but never of penny floors.
"We took 27,000 1p coins and decided to give our kitchen diner a new look. Each coin was individually glued to the floor which had been self levelled before hand and left to dry. After gluing down all the coins a black grout was applied to fill the gaps followed by a high gloss epoxy resin to cover and seal."
Thumbnail Photo Credit: Matt Giles YouTube Channel