@Angelina_Edmonston, What an interesting and good question! First, let’s consider a simple definition of imagination: “the faculty or action of forming new ideas, or images or concepts of external objects not present to the senses.”
I think the Bible cultivates our imagination in many ways. For instance, to read the poetry of the Psalms, or the vivid details of the historical narratives, or the animated language of the prophetic writings inevitably requires the reader to use their imagination.
Perhaps my favorite verse on the imagination is Philippians 4:8, “Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things.” This seems to be a robust, even thorough encouragement to use our minds to think about all kinds of ideas and situations that are good.