Create balloons with melted colourful sugar with the help of small rubber balloons and fix it on the colourful cake.
Draw a colourful portrait and make balloons the highlighting element.
Use bendable wires to create a balloon frame and decorate it with metallic elements, gold and silver leaves and flowers.
Make a three-story cake with a colour scheme and decorate each level with sugar balloons.
Make edible balloons with coloured chocolate and stretch it to the cake in an artistic pattern.