Don't care for the white backgrounds everywhere. Going to be even more difficult to use at night. Wish there was a way to choose a theme, like we had in the 90's.
http://lifehacker.com/5957534/invert-your-phones-colors-for-...
Another thing that really helps is f.lux for iphone:
http://justgetflux.com/ios.html
But this sadly requires jailbreaking.
Most utility apps that aren't supporting an existing brand will often support both themes. However I've noticed that apps that are already branded will go along with only the theme that works best with their brand.