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Scratching is a chicken's favorite pastime. If you can set up a little pen outdoors in your yard on a nice sunny day to let your chicks scratch around in the grass and dirt, that will make them so happy! Keep an eye on them, though, to make sure they're not too hot/cold or at risk from predators.
If you can't manage a way to do that, and your brooder is big enough, you could buy one of those squares of turf (just make sure it doesn't have chemicals on or in it), and let them play on that.