Piton to stop up the door (wedge it shut)

Depending on how the conjuration works, put your fingers next to the lock, and let the key form INSIDE the lock, to assure its teeth match.

Pole for crossing pits

Arrow (cause no one cares if its good or not)

very flimsy Chair for being lazy

Any object for the purposes of the 5' light. Easier to hide when looking at secret documents (think mini flashlight) in the dark

Shell game with a vanishing ball.

Does anyone know if the conjured object can be inflated? If so, it has all sorts of applications then.