Please visit the website [url removed, login to view], when the site opens you will notice lots of small/big thumbnails under heading "What's popular right now" and those images are linked to some pages.
On my website portfolio system is developed where user upload the images, you need to call the latest upload images which have more than 2 views from the portfolio system and those linked to the portfolio. Our other coder which created the portfolio system can help you in this (if required)... how you can call the images from database but your logic of creating a image wall with small big thumbnails must be clear.
Image wall must be fast loading and full open like an image which you can see in the listed website page.
Good Knowledge PHP, Jquery, mysql is very much required and? knowledge of Zend Framework and MVC code conception is plus which makes your task easier.
Work must be good and scripts must be secure. Work must be w3c compatible. IF you have any other question then don't hesitate to ask.