Photoshop brushes are incredible! I just discovered them and have been playing with them for two days straight.

They’re like rubber stamps on steroids. You can control the brush dynamics – the separation of each individual “stamp”, the color and brightness “jitter”, randomness, edges, etc.

I’ve found many sites that offer free brush sets, but
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Truly-Sarah.com

and

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AnnikaVonHoldt.com

are my current favorites. AnnikaVonHoldt’s brushes are like instant creativity! You will be creating beautiful and mysterious fantasy images almost automatically.

Update: the Truly-sarah.com site is no longer online, but some of her brushes can be found at trulysarah.deviantart.com

My first attempt using brushes from these sites: