Adobe Photoshop is a bitmap editor but it has some vector graphics tools too. For example, the Custom Shape tool.
http://www.shapes4free.com/
http://www.fontonic.com/shapes.php
http://www.free4photoshop.com/
http://www.shapesforphotoshop.com/csh/florals-and-ornaments/
http://www.photoshopstar.com/resources/photoshop-custom-shapes/
http://www.smashingmagazine.com/2008/12/11/the-ultimate-collection-of-photoshop-custom-shapes/
http://www.cssauthor.com/the-huge-collection-of-photoshop-custom-shapes-for-beautiful-designs/
