Illustrator brushes are always underestimated and AI brushes are a lot less around than Photoshop brushes, but I looked all over the web to search for the best brushes, I could find. Also note, in Adobe homepage You must register in order to download brushes, but I think it’s really worth it and for the most cases read description to use brushes correctly. So here You have 30 beautiful Illustrator brushes for daily use! And I am really hoping these brushes will help in Your workflow, as these do and did in mine. Cheers!
If You know more great sources, where to find beautiful brushes, please share with us! Thanks!
Source
http://www.1stwebdesigner.com/freebies/30-beautiful-illustrator-brush-and-symbol-collection/