Zee has some awesome answers for you:
Throw the blanket over someone and whack them with the brick.
Tie blanket around brick to make a parachute.
Tie blanket around the brick and use as a hard pillow.
Hollow out brick and cut piece of blanket to use as sailboat.
Tie blanket into a knot and juggle it with the brick.
Dig a hole and cover with the blanket. Put the brick in front of it and make pit fall trap.
Break a shard of brick and use as a pin to wear the blanket.
See his pictures here as well.