title: Website for generic web images used as background for header text?
body: <p>For some web sites I want to have a header text on top of an image. I don't want the image to be a photo, a picture of anything nor a repeating textured background. 
  I am not sure what I am looking for but the image needs to be subtle and not strong. An example could be random color waves. The idea is to use these images instead of a boring solid color as the background image in a header div.</p>
  
  <p>Any free sites which provide such images to borrow from?</p>