If I had to make this then I would make a plain iced buttercream sheet cake.
Printed sugar sheets and a spatula through the buttercream for the swoosh.
gumpaste and use of an edible image.
http://blog.pinkcakebox.com/barrel-of-money-birthday-cake-2009-11-08.htm
See how the fifty is falling of the barrel? well yours would be "swoosh" like.
If that is not of help, you could google " money cake " under images in google.
More links
http://www.myspace.com/mryoungceo/photos/49125359
http://www.yourhappycake.com/party.html
on this one click on the two suitcases with money
http://www.dollhousecakes.com/2011/01/28/money-birthday-cake/
http://cakecentral.com/t/14673/money-cake-ideas
Good luck!
Ciao!
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