Start by covering your cake all over with a generous layer of buttercream, approximately five millimetres thick. Smooth it over with a palette knife; however it doesn’t need to be perfect!
Have your chocolate eggs ready to go and, starting at the base of the cake, begin sticking the eggs to the cake in colour pairs, (two white, two pink, two yellow, two purple) repeating the pattern all the way around the base.
For the second row of eggs, repeat the same pattern of colour pairs but shift the pattern along anti-clockwise by one egg.
Build up the layers of eggs row by row, making sure to shift the pattern along anti-clockwise by one egg every time you start a new row.
Repeat the pattern on top of the cake, starting from the outside edge and working inwards in concentric circles.