One reason I use a plain black background for my iPhone--I can actually read the labels under each icon. (I could use plain text rather than icons, but that's a different gripe.)

Also, I can actually read the battery level indicator in the skeuomorphic display. I sometimes resort to getting out a magnifying glass to read it on my iPhone's current display. (Yes, I have old eyes. And I have to keep telling those Apple UI people to get off my grass.)