These are Photoshop 6 (and up I'm assuming, since they work with CS3) eggshell brushes. I hope these help all of you digital artists and photomanipulators to create some fantastic stuff!
Here is how I used these brushes: [link]
Also, a second set is now out: [link]
1) Credit in the deviation comments of the deviation you use this brush set for
2) Send me a link on this deviation or my main page, because I'd love to see the result!