Three-Tiered White Cake with Sprikles. Sprinkles aren't just for kids! If you're having a more casual, whimsical reception (or maybe you and your groom are just kids at heart!), choose a simple buttercream-frosted wedding cake decorated with a smattering of sprinkles, like this confection by Eileen McCarter, which first appeared in our sprinkle cake round up. The look is modern, playful, and totally unexpected.