A logo is a graphic mark or emblem commonly used by commercial enterprises, organizations and even individuals to aid and promote instant public recognition. If you do not have your own logo, you can create it right now. Each theme from LizardThemes.com has a PSD file of the logo which comes with a theme. It is in the directory /psd of the theme. This logo design best fits the theme that uses it. So you can open this file in Photoshop, write title of your website instead of a standard text there, then save it as png or jpeg and upload to your website, using option “Logo” on page General of the theme settings in your dashboard.