title: Custom colors in UITabBar
body: <p>Is it possible to use custom colors and background images in a UITabBar?  I realize that Apple would like everyone to use the same blue and gray tab bars, but is there any way to customize this?</p>
  
  <p>Second, even I were to create my own TabBar-like view controller, along with custom images, would this violate <strong>Apple's Human Interface Guidelines?</strong></p>