This is a list of various resources that can be helpful in the design process.
Photoshop Gradients
http://www.dezinerfolio.com/2007/03/14/ultimate-web-20-gradients-free-download/
Photoshop Brushes
http://pfefferminzchen.deviantart.com/art/Watercolours-3-PS-7-0-56588068
http://www.bittbox.com/freebies/free-hi-res-watercolor-photoshop-brushes
http://www.fudgegraphics.com/2008/05/high-resolution-watercolour-photoshop-brushes/
Splatter -grunge look or just texture
http://www.bittbox.com/freebies/free-hi-res-splatter-photoshop-brushes
http://www.bittbox.com/freebies/free-high-res-grunge-ink-splatter-brushes