Parmanoir

Using CGContextDrawRadialGradient to draw the background renders a smoother gradient than a linear gradient :

The 'fully radial' looks like a linear 'ping pong' gradient, it's in fact the bottom of the radial gradient, stretched to fit the entire view height.

As I didn't put sample code on Oval radial gradients, here's some to draw a radial background, change colors and 'radialness' : RadialGradients.zip.