Make dark chocolate buttercream and add black food coloring.If you start with chocolate,you wouldn't need so much black,but if you don't then you'll need a lot and the taste of your buttercream will change due to lots of black gel coloring. Good luck.
I do it like solascakes. I start with very dark chocolate buttercream, then add Americolor Super Black and it only takes a little to get a good deep black. And it tastes like chocolate.
I actually keep the leftovers in a small container in the freezer. That way when I need just a little black for eyes or whatever I don't have to make it every time. And because I don't always have dark chocolate buttercream on hand.
Good Luck!
You could try spraying it black with Wilton food color spray.
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