I have been doing Ziatypes for a few years, and like the others here, have found the process pretty straight forward. One tweak I rather like is the colour range you can get replacing some of the palladium with gold.
At one time I was keen to try the new Chrysotype process developed by Mike Ware, so had some gold solution to hand. But, as I was printing using the Ziatype process at the time I had a go adding gold to the sensitiser solution in place of some of the palladium. With less gold than palladium the prints take on a cool blue colour like the print of the feather.
Whereas adding more gold than palladium starts to produce a deeper blue with reddish tones like the print of the Buddha, much like have been described with chrysotypes. The print of the feather had around 3 drops of 5% gold solution and 4 drops of the palladium solution, the Buddha had 5 drops of gold solution to 3 of the palladium.