You may not know this, considering it isn't referenced amongst any of the site's links or modules, but Theia comes with a simple "link to us" page you can use to dynamically load up different banner images you have and provide respective HTML code for your users to use if they want to use the banner on their site

To upload banners, you need to use your FTP client now, as there is no interface, at the moment, within any of the admin tools. When you are connected in FTP, navigate to the base directory Theia is installed in, and then go into DIR_PIC/banners (on a default installation, this is pics/banners). Any images you upload into this directory will automatically appear on the "link to us" page, along with the code to link to your site.

Finally, the "link to us" page is located at:

http://www.sikosoft.com/linktous.php

... where www.sikosoft.com should be replaced with the base URL to your site.