If you're making butter icing, why not make them Butterfly cakes? Slice the domed top off each cake, horizontally, and cut the little disc/dome you cut off in half to form two semi circles. Put a blob of butter icing on the cake, then push the straight edges of the semicircular bits into the icing, so that it looks like a butterfly has landed on it....
Or make them marbled. Divide your mix into 3, colour one lot with pink, one with chocolate, and put a blob of each in each case, give it one swirl with a skewer and allow to mingle as they bake.
Or go down the nostalgia/presentation route. Ice the cakes with pink glace icing and then decorate each one with either jellytots, smarties or silver balls.
My sister made cakes for Oli's christening on Sunday - there were lemon ones with a runny skicky lemon icing, and chocolate ones with a really thick butter type icing, but richer than buttercream, more like a stiff mousse, it actually sat on the cake like a blob, rather than spreading. Lovely!