RESOURCE: http://designm.ag/resources/free-illustrator-brushes/

Although some of these brushes take LOTS of space (esp the marker ones) pretty cool resources.

27 Sets of Useful and Free Adobe Illustrator Brushes

By: Steven Snell | January 20th, 2010 | 24 Comments

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For Illustrator users, high-quality brushes can save time and help to produce impressive results. In this post we’ll feature 27 sets of free brushes to spark your work with Illustrator. For more brushes, see 45 Excellent Sets of Adobe illustrator Brushes and 30 Sets of High-Quality Adobe Illustrator Brushes.
Chalk Illustrator Brushes

Illustrator Grunge Brushes

Illustrator Grunge Brushes 2

Scatter Brushes

Brushstokes

Illustrative Brushes

Teardrop Foliage Illustrator Brushes

Vector Marker Brushes

Technix Brushes

Construct Brushes

Ink Sketch Lines

Illustrator Thick Brushes

Smoke Brushes

Woodcuts Brushes

Spanners Brush Pack

Inky Pen Brushes

DRW Brushes

Artistic Brushes

Glowing Blurry Brushes

Rope Brushes

Abstract Brushes

Floral Brush Kit

Circles and Drips Brushes

Dash Dot Brushes

Ornate Borders

Scatter Brushes

Snowflake Illustrator Brushes

For some great Photoshop brushes please see:

• 250+ Light Effect Brushes for Photoshop
• 500+ Watercolor Brushes for Photoshop
• 500+ Photoshop Texture Brushes
• 400+ Floral Brushes for Photoshop