iPhone App - Image Shuffler

Basically what I need to create is an app which loads a random image and once a button is tapped, another image is returned at random. Images would be stored in a directory on my server, not within the app itself. For reference please refer to this screenshot of the popular application Shazam. [login to view URL] Essentially, this is how I have envisioned the app to look like. (Based on the above screenshot) In the blue content area is where the Image would display. The tabbed menu area would also be similar. The central button as seen in the screenshot would act as the 'Shuffle' or 'Randomise' button and some of the other tabs will be used for other functions. Probably, an Information page. And also one of them could act as a 'Save' button. Where once pressed whatever random image is loaded to the content area - it would save to the users Photo Roll. I will be able to provide some graphics however, if you are experienced with simple icon design that would be a positive too!