Rainbow Birthday Cake

This is my first ever attempt at icing a cake, so please excuse the clumsiness! Also, some small person pushed their finger into the cake while I was getting the camera ready, grrr! I used this very easy and reliable spomge recipe here ... victoria sponge recipe.

I used gel paste colouring to make the rainbow sponge, and for the coloured circle decorations. I used ready to use fondant icing.