The theme will have two main tabs, spread over the entire screen (no borders, sidebars, etc.).
First tab will show the user two boxes (large buttons), for different options. Each option would lead to a different page:
both pages will show the user a text box and will allow him to send a message. This text box may need to be overlayed on an image I'll provide. It needs to have two buttons - "send" and "clear" (for clearing the text).
THIS IS the tricky part: these text boxes need to be, in fact, WordPress COMMENT input fields. One page will be entitled "private" and the other "public". When comments sent on the "public" page are approved in the admin control panel (and only for those), they will be displayed in a slideshow on the second tab of the theme! We'll need to find a cool plugin / script for that slideshow.
The second tab (the slideshow tab) is the default tab. It is the tab displayed when the website comes up.