WordNet sense 1 (of a display that is tawdry or vulgar):

kitsch, ostentatious

WordNet sense 2 (affectedly genteel):

grandiose

WordNet sense 3 (puffed up with vanity):

grandiloquent, pompous

WordNet sense 4 (showily imitative of art or artists):

arty

WordNet sense 5 (marked by ostentation but often tasteless):

showy