Preheat the oven to 190°C (170°C for fan oven) / 375°F.
Beat the butter and Siúcra Caster Sugar together with an electric whisk until combined.
Add one egg and beat. Then add the second egg and the vanilla extract and beat again.
Finally beat in the flour at a low speed to mix. Once mixed form into a ball of dough with your hands.
Put the ball of dough onto a work surface that you have lightly dusted with flour.
Roll out the dough to approximately 1/2 cm thick with a rolling pin.
Cut out shapes using the cookie cutters.
Lift carefully onto a baking tray lined with baking parchment.
Bake in the oven for 14-15 minutes until golden.
Remove from the oven and allow to cool on the tray.
Divide the Siúcra Rollout Icing Sugar into 6 pieces and knead until it softens.
To colour the icing put a small amount of colour onto the white icing and knead it in until it is well combined. (You may want to wear gloves when doing this to avoid staining.) Add more colour if necessary.
Colour one piece pink using a small amount of red colour. Colour another piece purple, another piece blue, another piece yellow and finally another piece green. Leave the final piece white.
Dust your work surface with Siúcra icing sugar.
Roll the icing out to a thin layer and cut out the same shapes that you used for the biscuits.
Make up the Royal Icing as per pack instructions. Put a few dots of this icing onto the biscuit. This will act as the glue.
Lift the icing shape off the work surface very carefully and place on top of the biscuit.
Decorate as you wish, you can use different cutters, a stitching tool or silver and pearl balls.