Buttercream is amazing stuff. I mean, no part of the word is wrong: it's composed of equal parts "butter" and "cream". And the actual substance is great, too: butter, confectioners' sugar, a little cream, and sometimes even pink coloring.
Yes, I love buttercream. But today I've got to tell you that it's not the only frosting.
Greek yogurt cake frosting deserves your love, too. I would consider this more like a cream cheese frosting in that it has a tang, but the greek yogurt version has a unique texture, which is almost like a soft fondant, that makes it a fascinating food experience. I say you give it a try.