Is this the type of improv where you have to pull things randomly from a box? We always had fun stumping each other by attaching two things together. Superglue a small ball in a rubber chickens "hands." Tie something to a tennis/badminton racket. A calculator paper roll on a keyboard. What would you put on a hand mirror? (T.P. would be a rearview mirror. NOOO!) Cut two stuffed animals and transpose heads. I hope this sparks some ideas. Have fun! I wish I could see the show!
You could use random items like hot air balloons, freezer bags, tires, sponges and trans. You can also use things like flowers, rings and dolls. You can also get some more ideas from your science teacher.