Whilst your balls are in the freezer, make your irises. Dust a smooth surface with a little icing sugar and roll out your blue icing to around 1/8-1/4cm (1/8") thick. Cut out small circles.
50 g ready to roll blue icing
Repeat this process for the pupils using the black icing and cutting out smaller circles. I used two different sizes of metal straw and it worked perfectly. You could also use the two ends of a metal piping nozzle. (Please see the recipe video for a demonstration). 20 g ready to roll black icing
Glue the pupil to the centre of the iris with your edible glue and set it aside to dry.
Dust your surface with a little more icing sugar if needed and then roll out your white icing to around 1/4cm (1/8") thick.
500 g ready to roll white icing
Take 5 of your balls out of the freezer at a time, leaving the rest in the freezer. Cut out a white circle of icing large enough to cover your eyeballs. If you’ve cut it a little small you can roll out the circle a bit more with your rolling pin to expand it, it doesn’t need to be a perfect circle.
Wrap the white icing around the ball, patching any gaps with additional icing. Roll the ball between your hands until it is smooth and then pop it in a petit four case. At this point you can set it aside at room temperature, you were only keeping it frozen to aid the covering process.
You may notice that the icing goes glossy as the balls defrost but don’t worry about this, I found it actually aids the painting process and they will dry out again within an hour or so.
Once you’ve covered your five balls with white icing, glue the iris to the eyeball using edible glue.
Decorate the iris with your blue pens and then add a dot of white paint to the top corner of the pupil. Paint red veins on the white of the eye if desired. Go easy on the thickness of the paint as it can take a while to dry out - make it as thin as possible.
Repeat with the rest of your eye balls, 5 at a time. Leave over night at room temperature to dry out.