Hollywood and/or Movies continues to be a popular choice for a costume event.
(Outfits for a James Bond-style event can be found here on a series of special pages 
 
In most respects, almost any costume can be related to some film or other (although given the large number of British films, it may depend upon how strictly you interpret a 'Hollywood' theme).
This is a selection of our movie-inspired costume characters - click on each group to get the bigger picture! 

Alternatively, you can use the 'Decades' links on the lower half of the page to explore film characters by decade.

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Where you have a 'Decades' event, you might find these links helpful