I took the challenge literally and used the actual box tops as part of my design.
So I cut the tops of a Lipton Chicken Noodle Soup box and attached it to card stock, folded it up and got this. I know, not very descriptive, but if you have questions, you can always ask 🙂
Flower Stamp: Princess Flowerette by Unity Stamp Co.
Sentiment: SRM Stickers, Birthday Sentiments Sheet