Up and Beyond!
The blue box that I used for placing the cake represents sky, the cake represents clouds, and the balloons are hopes and dreams, flying above the sky to reach the star (the biggest balloon).
The cake was actually sugarless banana bread so my son could eat his cake as much as he likes. The frosting was a mix of cream cheese, whipped cream, and shredded cheddar cheese (yep, no sugar added). I made it plain white with fluffy texture to represent cloud and so that the focus is on the balloons.