are you asking about design, flavoring or both?
I typically won't eat anything without chocolate but... brunch screams mimosa, champagne and bellinis...maybe one of those flavors.....Maybe do cupcakes with a few flavors to choose from.
Ooooh @savannahquinn, a mimosa cake sounds delicious! I'm picturing a champagne flavored white cake with orange flavored buttercream maybe with mandarin orange slices in the filling with a beautiful orange/yellow ombre sunset color on the outside.
or bellini with champagne cake, peach buttercream and raspberry/chambord filling....sounds good to me !
In my family, brunch must include a Coffee Cake (especially with pecans in the topping) or an Angel Food cake (and often both). 
There are alternatives to standard angel cake as well, like brown sugar angel cake or chocolate..all light options. :)
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