Each site has it's own colour, like Stackoverflow has orange, SuperUser has blue and Serverfault has red, not entirely sure StackApps (dark orange?). Would it be possible to provide these colours in the styling info from StackAuth or is getting too close to copy the style of the site? Just this would make it more obvious as to which site the currently viewed question on my app is on.
The colour I'm talking about is when you click one of the buttons next to the big site Logo image at the top, eg:http://stackoverflow.com/questions The questions button is orange, and it's that orange I'm talking about.