Over two years ago now my little nephew had a first birthday! For his birthday his parents got him a ball pit- that was the theme of his birthday I guess. Because everyone contributed to it. That kid had a fuller ball pit than any local McDonald's. So naturally, his cake went along with the theme (we all know how much the Baker's love to theme everything)
I made the little balls tumbling down the side of the cake- with a few of them bouncing away.