To me it looks like they were little squares, but in covering with fondant the edges became rounded. But that's just a guess. I have never done mini cakes, and have no desire to. I would quote a super high price for the mini's, and a price of what cupcakes, or satellite cakes would be for the same number of servings. Let them see the error of their ways!
On a side note, i do LOVE the bright colors.