After reading this article that Paul Lloyd pointed me to http://aentan.com/design/new-visual-proportions-for-the-ios-user-interface/ I have now been laying out all my iphone screens on an 8px grid (designing for retina displays first). It does indeed give everything a bit more of a rhythm.
Ideally this is the generic error page fallback, with the technical details needed for debugging to be included in the email when the use clicks 'email us'. This I think would be a good compromise between providing a human readable error and giving our developers enough information for when people get in touch.
I am not really used to illustration (I am doing everything, illustration included in Adobe Fireworks) The envelope and button I made myself rather than using stock resources.
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