TimeToSignUp sheet creators have the option to change the icon that appears beside the title of the TimeToSignUp sheet.
Before:

After:

The icon can be chosen when creating the TimeToSignUp sheet, or as these directions show, the icon can be changed after the TimeToSignUp sheet has been created.
- Log in as the TimeToSignUp administrator for your account.
- Go to the TimeToSignUp sheet.
- From the Sign Up Sheet Administrator Options drop-down menu, choose Edit title, comment, visibility, undo date, etc

- Press/click on the existing icon

- Select a new icon from the available choices by pressing/clicking on the desired icon

- Press the Save Changes button
