Have made these 2 types of cakes last 2 weeks, using the same recipe - Light Butter Cake. For Lamington I use the basic cake then coat with chocolate and dessicated coconut, as for the chocolate cake I just replace 20g of cake flour by cocoa powder, quite success for this recipe, next time can try adding other things like raisin or pandan juice then it will become raisin cake and pandan butter cake ^_^