Chocolate orange: After dividing the cake mixtures, mix 2 tbsp cocoa powder with 1 tbsp just-boiled water. Cool until lukewarm. Stir through half the cake mixture. Stir grated orange zest and a few drops of orange food colouring through the other half. Sandwich the cakes with marmalade and replace the marzipan with ready-to-roll chocolate icing.
Coffee and walnut: After dividing the cake mixtures, dissolve 2 tsp coffee in 2 tsp just-boiled water. Cool until lukewarm. Stir through half the cake mixture along with a handful of fnely chopped walnuts. When assembled, coat in a coffee buttercream icing to fnish.
Strawberries and cream: Stir 2 tbsp strawberry jam through the pink cake mixture and use strawberry jam in place of apricot. Coat in a mascarpone, icing sugar and whipped cream frosting to finish.