A set of circles and drips symbols for use in Illustrator. Just place the .ai file into the Presets -> Brushes folder within the Illustrator directory, and it should then be available just like all your other brush libraries.
A symbol version is also available for those who want to use them as symbols. [link]
If you want to use these as photoshop brushes, just download the full-view preview image and convert away.
UPDATE: Find out how I made these brushes here: [link]
Just remember to credit me if you use them (and I'd be interested to see your finished product, so you could let me know too if you felt like it)