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.).

Design a calculator. Standard, scientific, or specialty calculator for something such as a mortgage? Is it for a phone, a tablet, a web app?

Design an app icon. What best represents the brand or product? Or is it incredibly unique? Does it look great at a distance and does it stand out when put on your home screen alongside other apps?

Design a user profile and be mindful of the most important data, names, imagery, placement, etc. Is it for a serious profile? A social profile?

Design settings for something. Is it for security or privacy settings? Game settings? What is it and what's important?

Design a 404 page. Does it suit the brand's style? Is it user-friendly? It might sound mundane, but not everthing can be flash or glamorous. Every day millions of people will be landing on 404 pages. You have an opportunity to help them in a way that's useful and aesthetically pleasing.

Design a music player. Consider the controls, placements, imagery such as the artist or album cover, etc. Also, consider the device type that's playing the music. A dashboard in a tourbus, a smartwatch, or via a web browser. Each device type will have different requirements, features, and restrictions to consider.