WordNet (r) 3.0 (2006):

window dressing
    n 1: a showy misrepresentation intended to conceal something
         unpleasant [syn: facade, window dressing]
    2: the decoration of shop windows

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "window dressing":
   acting, adjunct, adornment, affectation, anteriority, appearance,
   arrangement, attitudinizing, bluff, bluffing, bold front,
   brave face, brave front, cheating, color, color patterns, coloring,
   deception, decor, decoration, delusion, disguise, display,
   dissemblance, dissembling, dissimulation, elaboration,
   embellishment, emblazonment, emblazonry, embroidery, facade, face,
   facet, facia, fakery, faking, false air, false front, false show,
   falsity, feigning, feint, flourish, flower arrangement, fore,
   forefront, foreground, forehand, foreland, forepart, forequarter,
   foreside, foreword, four-flushing, fraud, front, front elevation,
   front man, front matter, front page, front view, frontage, frontal,
   frontier, frontispiece, furniture arrangement, garnish,
   garnishment, garniture, gilt, gloss, head, heading, humbug,
   humbuggery, illumination, imposture, lap, masquerade,
   meretriciousness, obverse, ornament, ornamentation, ostentation,
   outward show, playacting, pose, posing, posture, preface, prefix,
   pretense, pretension, pretext, priority, proscenium, put-on,
   representation, seeming, semblance, sham, show, simulacrum,
   simulation, speciousness, trim, trimming, varnish, veneer