Recently my daughter mentioned that her teacher had read aloud Waiting Is Not Easy! (Elephant & Piggie) by Mo Willems to the class. That evening (or possibly the next day) my daughter made a big point of telling my husband and me that she had a surprise for us, but that we would have to wait a bit. Not too long afterwards she dragged us upstairs to view what was, in fact, a spectacular sunset. She kept asking: "Do you like my surprise?". And we did.
I didn't put it together until my daughter and I read Waiting Is Not Easy! a couple of days later, and I was reminded that the premise of the book is that Piggie has a surprise for Gerald, for which he has to wait all day, and which turns out to be the stars in the night sky.
So my daughter borrowed that premise, modified it for our home (from which we do often get nice sunset views), and made it her own. This is learning from books at its finest. I was very proud.
Do your kids "borrow" ideas from books?