Riddle Me Not

I can be huge.

Or unusually small.

Kids use me daily.

Makes tales that are tall.

I can be real.

Or just a nice dream.

If you just use this thing.

Real – anything could seem.

I could be a monster.

Or an invention of times.

You can use me to think of ideas.

Or plot out huge crimes.

Without me, you’re dull.

Just don’t even try.

I just have one more thing left.

Do you know who am I?

Check Braingle.com for the answer.