I had the opportunity to present at the local iDev Meetup last month, and am only just now getting around to posting the slide deck for the talk, which I called creatively, Customizing iOS UI: Fonts, Controls, and Color. You should be able to view the slides below.
The source code for the talk is also available, and on most of the slides, you’ll see some text along the lines of demo-1, demo-2, etc. Those are the git tags that I used to fast forward my code to the relevant part of the talk. (Thought that needed explaining.)