Icon needed for Photo Maps iPhone app

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Hello everyone,

I need an icon for my iPhone/iPod application.

The app allows users to see photos from all over the world. (See attached screenshot).

App description:
The user can go to any location using the map and the photo strip at the bottom will update with photos from the area which the map is currently showing. The user can scroll the photo strip by dragging it to reveal more photos. The pin on the map is automatically updated to show the location of the photo in the middle.

Tapping on a photo brings up the photo in full screen.

Icon requirements:

I need the following sizes:
57x57 pixels (icon)
114x114 pixels (icon for retina display)
512x512 pixels (AppStore icon)

Icons:
- 90 degree corners (rounded corners added by Apple)
- No alpha transparency

The 512x512 sized icon should preferably have some more detail than the lower sized icons.

I would like the icon to represent the interface of the application (see screenshot). So upper part would consist of a map and lower part a photo strip with photos. (If you have another idea feel free to try that.)