A few ideas come to mind--When you say funky I think whimsical style and when you say choc money I think the choc. coins you can get for in a treasure chest.
Can you give us some more specifics on the cake, like number of servings, stacked or sheet?
what about a sheet cake shaped into an open hand and large chocolate or fondant rectangles maybe in different colors like monopoly money fanned out over the hand? Put different denominations on each chocolate or fondant bill.
Or maybe a sheet cake with an edible image of the child on it in place of the president. Make the bill like a million dollars...
kjb I really like your second idea. That could be very cute. Where is Mountaintop PA? I am in WV very close to the state line.
I don't know about you Leah, but I am new to this decorating thing to and I want to try a whimsical cake but am scared. A sheet cake is always safe.
I'm up here in North East PA. I to am new to the cake world too however I love trying new things. I usually run out of talent half way and have a panic attack that the cake won't turn out. But, usually 3 hours later and extra BCI it's looking a lot better...or I'm really tired and that's as good as it will get.
I like that last picture of the bag of money. very fun looking!
Im not to sure how Id make the paper money though.. or maybe Ill just use real monopoly money... Yeah I think MommyEdzards right on the money with this one! LOL (Sorry I couldn't resist) 
or you can go international... with the money..
if you type in euro, pound, yen, rouble, dinar etc. in google and search for images.. you should get plenty of images. You can do a colored photocopy and stick the money in money bag..
http://images.google.com/images?hl=en&lr=&rls=GGLD,GGLD:2004-16,GGLD:en&q=rouble&sa=N&tab=wi
or you can do a funky timeline of money.. from stones and cowries to plastic money.. you can make it out of fondant or gumpaste..
these ideas might be fun for kids..
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