Here’s a free set of vector and pixel patterns with a flowing leafy organic theme. Should be good for all those nature themed designs.

3 Illustrator patterns – EPS files – that you can load into Adobe Illustrator (or your favorite vector editor) and edit to change the scale, colors etc.
3 PNG thumbs that you can use right away in your web designs or load them into your Photoshop pattern library (Edit->Define Pattern)