Classic letterpress is done with raised dies (usually letters, but sometimes decorative images) made of metal or wood, which are inked and impressed into sheets or a continuous roll of paper. The result is a relief print in reverse. Some letterpress stationery is debossed without inking. An embossing folder is made of hard plastic and has positive and negative surfaces (the same design that is raised on one side is depressed on the other - usually a full-panel design). Paper is enclosed in the folder and is shaped from both sides using the pressure of a rolling machine.
Ink up one side of an embossing folder for a faux letterpress effect - try the tutorial HERE
! (I got beautiful results with Versafine Clair ink!)