Print Resurfacing is one of my favorite techniques.  A variety of effects can be achieved through the simple process of heat pressing a printed image with a piece of specialty paper, ie: matte or gloss, between the print surface and the heat platten.  We have used this technique successfully over the years to mimic litho-transfer, create high-gloss jewel-tone, or even just to enhance halftone printing.  With a little R&D time (oh how I wish we had some) and creativity, many more effects could be achieved.  The following images show the two varieties of paper that we typically utilize as well as a promotional print that we use to show both resurfacing effects next to a standard print: