Popular Idioms About Boxes 

Life is a challenge sometimes. It's easy to conform and follow everyone else. It's harder to stand out, express your true thoughts, and "think outside the box". So today, with the help of my "Monsters", instead of just thinking outside the box, we destroyed the box!  And as you can see, they had a lot of fun doing it. Although, I realized afterward that I had "opened Pandora's box", as I had a whole mess to clean up!  But after a long day inside, I knew they probably felt "boxed-in" and they needed a way to exert some energy. I had planned to "box up" some items for storage, but I couldn't resist the urge to let the monsters have some fun. So, wherever life takes you, don't be afraid to let your inner monsters destroy that imaginary box. Just remember to live it fully, and don't "go home in a box!" 

think outside the box - to think freely and imaginatively, using new ideas instead of traditional or expected ideas; not bound by old, nonfunctional, or limiting structures, rules, or practices. (As if thinking or creativity were confined in or limited by a figurative box. Compare this with think inside the box.) 

open (a) Pandora's box -to do something that causes a lot of new problems that you did not expect. Usage notes: In old Greek stories, Zeus (= the king of the gods) gave Pandora a box that he told her not to open, but she did open it, and all the troubles in the world escaped from it.

box someone or something in - to trap or confine someone or something. To put someone into a bind; to reduce the number of someone's alternatives.

box something up - to place something in a box.

go home in a box - to be shipped home dead.