I honestly have not decided at all what our cake will be like. I'm planning to have one within the Ritz-Carlton package but I need to give them a design of some sorts for a two tiered cake. Here are some ideas I've got. I love the idea of 1 tier being one color, one tier being the other.

This cake has a beautiful finish, maybe this finish, 2 colours on each tier with the ribbon being the contrasting colour.....? Could work right?

Here's some more rather random ideas which I like....

As for flavour I have no idea, but mine and Lover's favourite cake ever is Carrot Cake so maybe that, we'll see what the RC will do!

Pics all taken from theknot.com