I'd go art deco. It's actually a pretty easy look to do. Ideas:
http://www.google.com/search?tbm=isch&hl=en&source=hp&biw=1280&bih=681&q=art+deco+cake&gbv=2&oq=art+deco+cake&aq=f&aqi=g4&aql=&gs_sm=e&gs_upl=2531l5106l0l5300l13l13l0l1l1l0l213l1616l3.8.1l12l0
The idea of 1930's fashion is great - especially if the cake is for a lady.
http://schumpeter2006.org/1920s-and-1930s-fashion-pictures.html
http://www.thecheapdesignerpurses.com/blog/1930s-fashion/ (The 1930's Dresses - they are beautiful)
http://www.perfect-wedding-day.com/art-deco-wedding-cake.html (these are wedding cakes but can inspire you)
http://www.perfect-wedding-day.com/art-deco-wedding-cake.html (these are wedding cakes but can inspirate you)[/quote]
TY for sharing that site... i spent 20 minutes on it, and had to save it to my favorites!
Humm. The 30's were a turbulent period. The great depression, FDR was president, the new deal, and the rise of Adolph Hitler. There were some great films "It happened one Night, "Animal Crackers," King Kong." Mae West and Charlie Chaplin also were a part of the period. You could just do Hollywood of the thirties. Art Deco was just a small part of it.
http://www.perfect-wedding-day.com/art-deco-wedding-cake.html (these are wedding cakes but can inspirate you)
TY for sharing that site... i spent 20 minutes on it, and had to save it to my favorites![/quote]
My virus scanning software just blocked that website. Go there with caution.
Feathers, fringing, beads and art deco patterns are all quite reflective of this era 
have a look at some of these cakes for inspiration:
bright feather pattern -> http://www.flickr.com/photos/cakechester/4087262702/
art deco + feathers --> http://dev.pandemedia.biz/scattercake/staging/cakes/cake_category.php?category=2&cake=59
probably my favourite one with a funky gumpaste figure --> http://www.ideasinicing.com.au/admin/images/FLAPPER.jpg
beads and feathers --> http://artisancakecompany.com/wp-content/uploads/2010/09/Peacock_wedding_cake.jpg
and a nifty painted one, this ones a bit different (softer?) from the rest http://www.flickr.com/photos/neviepiecakes/4502315506/
hope that helps 
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This is a little more 1920s but maybe it will give you some inspiration: http://cakecentral.com/gallery/1898824
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