So Im making my first big cake and have gotten tons of helpful hints in my previous thread with the actual cake, but now I need suggestions on the flavours of the cake and frosting. We have chocolate/vanilla cupcakes for the kids, so this cake will be mostly for the adults. I want to make the cake as a coffee flavoured one.

Here's my plan, feel free to tweak it or give me suggestion on how to add more flavour, or a different flavour...to get the WOW factor. What other flavour could be good with coffee? I'm making 2 separate 2" inch cake, and will be torting it. So I'll have 3 layers of frosting.

Bake 1 cake with white cake mix, instead of water add brewed espresso to the cake.
Bake the 2nd one with french vanilla cake mix, should I bother adding brewed espresso to this one?

Add brewed espresso to the buttercream frosting instead of water.

I've made a trail cake last week, it was good but maybe a little too coffee, french vanilla flavour...thats why Im think maybe adding a different flavour either into the cake or the frosting. But Im aweful with coming up with something....what would be a good combination of coffee and another flavour? And in what the cake or frosting?

I would do a coffee flavoured cake , with a white chocolate,vanilla bean flavoured filling.

Not *everyone* likes coffee! I hate it. Maybe doing just one tier in coffee and another one plain/different would be a good idea.

So I revised my flavours, and really really would appreciate feedback. Since the cake will be 4" inch high in total.
Now here's a suggestion given by my 10 year old, adding nutella as the filling for all the layers. Would this work if I mix it into the buttercream so it's not that strong? Also this cake is the bottom tier of a topsy turvy cake...the other 3 layers above it will be cake dummys. Would a filling work for such cake?

Will do the following...

1 layer in coffee flavoured caked made with brewed espresso
1 layer of chocolate cake
Both cakes will be made with the WASC carving cake, and torted.
Fill the layers with Nutella, mixed into buttercream, and have the outer frosting as buttercream with coffee flavour.

It sounds yummy to me, but concerned if it's mixing too many flavours?

Your selections sound good

For companions to coffee, I would suggest (separately) raspberry or almond. Take a look at (and/or a taste of) some of the flavored syrups offered at your local coffee shop. Me I don't like coffee by itself and I need something to "cover up" the coffee flavor.