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[_sjc_]

To save a colour object, you first have to archive it into a data object. The "User Defaults Programming Topics for Cocoa" describes how to do this (although for an NSColor object, but since they behave in the same way...).

Warning: I haven't tried running this yet, and it's based on Apple's example code only altered to use an NSKeyedArchiver, so it may include errors, or may just simply blow up, but hopefully it should set you off in the right direction.

To save the colour:

// first get the colour you want to save
UIColor *theColour = label.textColor;
// archive it into a data object
NSData *data = [NSKeyedArchiver archivedDataWithRootObject: theColour];
// write the data into the user defaults
[[NSUserDefaults standardUserDefaults] setObject: data forKey: kColorKey];

And then to recover it:

// declare the colour var you'll be needing
UIColor *theColour;
// read the data back from the user defaults
NSData *data= [[NSUserDefaults standardUserDefaults] dataForKey: kColorKey];
// check whether you got anything
if(data == nil) {
  // use this to set the colour the first time your app runs
  theColour = [UIColor someColor];
} else {
  // this recreates the colour you saved
  theColour = (NSColor *)[NSKeyedUnarchiver unarchiveObjectWithData: data];
}
// and finally set the colour of your label
label.textColor = theColour;