Create a sign up page, modal, form, or app screen related to signing up for something. It could be for a volunteer event, contest registration, a giveaway, or anything you can image.
Design a credit card checkout form or page. Don't forget the important elements such as the numbers, dates, security numbers, etc.
What's the main focus? Is it for a book, an album, a mobile app, a product? Consider important landing page elements (call-to-actions, clarity, etc.)