Ooooh, I would have so much fun with a class like this. I'd start out by reading "Nothing Ever Happens on 98th Street."
http://www.amazon.com/Nothing-Ever-Happens-90th-Street/dp/0531071367/ref=pd_sim_b_1
I'd have each student start a writer's notebook (composition books are .25 cents each at Staples through Wednesday (tomorrow). Their first homework assignment would be to decorate their notebooks with photos of themselves, family, friends, pictures of things they like (vacation spot, foods, colors), words that they like or words that describe them, etc... Buy fat clear packing tape and then tape over the covers the next day so they keep well.
I'd piggy back off of the 98th street book by taking them on a nature walk. Stop somewhere (even if it's on the campus where you are teaching), have everyone sit down and listen quietly for a few minutes. Have them start writing things they hear and see. No one talks! Discuss what they wrote and then have them pick one thing from their list to expand upon. Do this together first as a class. Take one "snapshot" in time and make it into a fiction or non-fiction piece. Tell them that's what good writer's do. The show and don't just tell. While they are working on their first piece, you can teach a mini-lesson each day on how to add "voice" as well as mini-lessons on word choice, organization, sentence fluency, and editing/conventions. The editing/conventions SHOULD NOT be the focus of a creative writing class though. Of course they should have things corrected before publishing anything though.
You might see if you can find a copy of the book "Salt Hands".
http://www.amazon.com/Hands-Picture...=sr_1_1?ie=UTF8&s=books&qid=1250660795&sr=1-1
It's out of print now so it's expensive, but your public library should have it. It's a picture book about a girl who sees a deer in the woods at night outside of her bedroom window. She feeds the wild deer some salt out of her outstretched hand. The author took a snapshot in time and added power words, description, & feeling. I remember reading how the girl in the book felt the deer's hot breath on her cold hands. She didn't just write, "I went outside and fed the deer some salt."
I'd give them assignments to go home and write in their writer's notebook about a snapshot they see at home. It could be something like watching their younger sibling eat dinner, or watching their pet dogs play together. The focus is "show me, don't tell me."
Teach the kids how to take these small moments in time and expand on them to write creatively.