BittBox provides a lot of free and original source files of photoshop brushes. You are free to use Bittbox files in posters, website designs, cd covers, postcards, annuals, flyers, business cards, branding, . . . DESIGN. Here are some of his photoshop brushes.

1. Free Illustrator Brushes: Teardrop Foliage
2. Free High-Res Grunge Ink Splatter Brushes
3. Free High-Res Photoshop Brushes - Leaves
4. Free Hi-Res Watercolor Photoshop Brushes Set II
5. Free Hi-Res Splatter Photoshop Brushes
6. Free Hi-Res Watercolor Photoshop Brushes
7. 30 Illustrator Pattern Brushes for Making Flowers and Circular Designs

Apart from these stunning brushes, there are a lot of free to download design elements and vectors. I am sure you will be amazed how useful they are.

Requirements: See License Agreement
Demo: http://www.bittbox.com/
License: Creative Commons License