I start with a base colour and then start adding elements on top of it, which consist of either white or black gradients with opacity levels adjusted to create highlights within a design. One of the other tricks I use is to make a gradient with the base colour. On one end of the gradient, I'll load the base colour into the colour picker and then use the HSB sliders to isolate just the brightness to go lighter or darker. You can also adjust the saturation which is another way to adjust depth; things farther away having less saturation.
On the technical side, you'll notice that I'm offering up an iPod version of the screencast. Having an iPhone myself, I couldn't help but give it a go. It's not too bad, although some of the subtlety that I try to demonstrate in the screencast is hard to see. I'll still export iPod versions of future screencasts—if only because it's easy to do with Handbrake.f2富二代官网入口