A few nice money images I found:
Money
Image by Images_of_Money
An image of big money which has been isolated on a white background
Like much of our work, we have put all these images in the public domain. Feel free to use them but please credit out site as the source if you do: TaxRebate.org.uk
Paper money
Image by kevin dooley
Paper money, extreme macro.
money and savings
Image by 401(K) 2013
money and savings
I am the designer for 401kcalculator.org. I have put all these images in the public domain and welcome anyone to use them however please credit our site as the source if you do:http://401kcalculator.org