The phrase "to dream up" means to imagine or create something in one's mind, often referring to a creative idea or concept that is not yet reality. Full definition
There was also a display of devices to facilitate breast - feeding, many dreamed up by new parents. (articles.chicagotribune.com)
I'm always dreaming up new ideas so let me know what protein pancake combination YOU are dreaming of and I'll put those wheels into motion! (abbeyskitchen.com)