If you use PhotoShop you might be knowing about brushes, PSBrushes offers a collections of Photoshop brushes well categorized into Abstract, Animals, Around the House, Drawings, Fractals, Grunge, Hearts, Humans, Landscapes, Music, Oriental, Outer Space, Patterns, Photos & Frames, Plants, Religious, Scratches, Shapes, Street & Misc Signs, Structural, Text & Type and War Brushes.
To install the brushes
Place the *.abr files into:
Program Files\Adobe\Adobe Photoshop X\Presets\Brushes where X is the version number for your version of Photoshop.
Download Brushes from here PSBrushes.