While the themes all have a sublime simpleness to them, you may want to make some adjustments to both the logo AND the color schemes.
Caution: Do not spend all your time making it look perfect and forget to add content! You may opt to move this until after you have added your content.
- Create a logo (or better yet, have a Photoshop savvy student do it for you!) and add it.
- Adjust the theme colors to better suit your personal preferences or your class.