Buttermilk Cake with 'Faux Buttercream' Recipe

I had some fun in the kitchen last I had gotten some heavy cream and decided to make butter, and a byproduct of home made butter is I've used buttermilk in cornbread before but wanted to use some in a cake.  A lady I know makes a chocolate cake with buttermilk, but I'd already made a couple of chocolate cakes and wanted to make a different cake this time.  I didn't want everyone to think I only knew how to make Chocolate Cake, even if it is sooooo good.  I should mention, I'm making cakes every couple of weeks for a cake raffle at the local It's a win win situation, they get a cake to raffle off, and I get to bake a cake, giggle, and decorate it. I like baking cakes, and decorating them as well but don't like them…