How can I keep lizards away from my room?
Get a cat

Get them jobs
I've heard they tend to enjoy selling insurance.

Mothballs?
Mothballs seem to be a popular recommendation.

Garlic: Not just for Dracula anymore.
Ever since Twilight, garlic has lost popularity as a vampire deterrent. Give it new life as a lizard repellent.

Onions
They keep my boss away, maybe they'll keep lizards away too.

Call Captain Kirk