Mix food colouring and lemon extract to make the watercolour and paint the cake fondant using a paintbrush creating a wash effect.
Apply the base layer of light colour fondant on the cake then while the fondant is wet, paint different colours directly into it.
Use a fine paintbrush to create different coloured flowers on the fondant.
Flick the bristles toward the cake to make a beautiful splatter effect.
Create an ombre gradient by painting the bottom of the cake with the darkest shade and gradually blending lighter shades to the top.