For writing:
Write your name backwards. Use a mirror to see if it reads correctly.
Is it harder to look in the mirror while you are writing?
Write a secret message to a partner. They can use the mirror to decipher it.

For drawing through a maze:
Lay the paper between the mirror and the barrier, so the maze can only be seen in the mirror.
Draw a way through the maze while looking at it in the mirror.
Make up your own maze to try.

Discussion of how the image is reversed in terms of light bouncing off the mirror.