Before you write, take two elements from what you have written on prior days and bring them near each other in your mind. If they formed a triangle with something, what would that third element be? Spend a minute envisioning it, then let it enter today’s writing if it wants to.
Alternately, bring your two elements into a collision in your mind, so that the materials and components of one mix together with the materials and components of the other. What new image is formed in this composite?
Note: You could choose almost anything as an “element”: a pair of sentences, a pair of locations, a pair of characters or gestures. It gets a little more associative and intuitive to pair across type – a sentence and a character’s action, a location and a gesture. In all these exercises, I recommend taking the first answering image that comes to your mind. The point is to bring something new into your writing that’s born from what’s already there, no matter how precisely it follows the prompt’s thought exercise.