bubbles and smoke

I am taking a photography class and I have a project due tomorrow. I am just playing around with some stuff I have at home.

First off we have bubbles...
A single bubble...

smoke....

more smoke with a cool curly spiral...

and more smoke....I like how the light lit this up...

I have to have 7 or 8 pictures.....hmmmm what else can I do? Any ideas?