WordNet sense 1 (marked by ostentation but often tasteless):

splashy

WordNet sense 2 (intended to attract notice and impress others):

ostentatious, pretentious

WordNet sense 3 (suited to or characteristic of the stage or theater):

theatrical

WordNet sense 4 ((used especially of clothes) marked by conspicuous display):

flashy, gaudy, jazzy, sporty

WordNet sense 5 (striking in variety and interest):

colourful