...
There are many more modules available on the PrestaShop Addons website. Some are free, other are for-pay, and you're sure to find something that suits your needs! Once you are a seasoned module developer/themertheme designer, you can even submit your own creations, and sell them on Addons!
...
PrestaShop also enables you to access your Addons account right from the back-office.
Log-in using the form on the "My Account" sub-tab, and get access to all your Addons details.
...
From this sub-tab, you can also choose to use another theme (if you have more than one installed already).
Finally, a section lists the latest themes from the Addons site, and you can click on any of them to reach their page, and possibly download them.