Start with a plain ordinary napkin and an embosser (my mother purchased mine for my birthday several years ago).
Put the plain corner (if some of the edges have a border) into the hand embosser. Gently squeeze the handle (not too tight or you will tear the napkin, but it has to be firm enough to leave the impression). You may have to try it a time or two.
Ta-Da!! Your embossed napkin, simple yet ellegant and expensive looking.