With the new Office 365 SharePoint 2013 Online now you can Change the look and feel of your Public SharePoint site with some awesome Out-of-Box Themes. Here is how you can do this
Next Make sure that your Website is Online. See my post at Akrura Technologies Blog Configure Public Website to be available anonymously in SharePoint 2013 Online to make your Website Online.
When you select one of the themes you would find some Interesting Options like you can Change the background Image of the site,select a color Scheme, Select the desired font and a desired Master Page. Once you are done click on “Try it Out” on the top right of the Master Page.
Next click on “Yes, Keep it” to apply this new Look.
Here is the Final Result. How do you like it?