Maybe do the base icing in a warm ivory or light brown, with a cascade of fall leaves and chrysanthemums down the side or around the tiers, and a wine colored ribbon around each?
The flowers come in a pretty wine/burgundy color in nature, so do some in the wine color to tie in the ribbon?
Or just do the wine colored mums?
Sounds like it will be pretty no matter what you do!
There are some really gorgeous fall-themed wedding and shower cakes in the galleries too.
I like the previous idea........
Here's a fall wedding cake I did. The flowers brought in most of the color.
http://www.cakecentral.com/cake-decorating-photos-by-aztomcat.html
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