Ok.  Advice greatly appreciated. I am doing a 1 tiered cake that will be 1 layer vanilla, 1 layer chocolate.  The customer wants light pink marshmallow fondant with whatever chocolate icing inside.  I usually BC all of my cakes.  First, if I do a chocolate BC, will it show through the pink fondant?  I don't really have a WOW chocolate icing recipe so I was thinking of trying ganache, but have questions?  

When doing ganache, what do you usually use for filling? What do you suggest I fill the cake with so it goes with both flavors and ganache?

Does ganache pair well with marsh fondant?

And again, will it show through the pink?  

I know white ganache is an option but in case customer turns it down

Thanks a bunch!!