Customizable 

Those Images in folder YOURTHEME/img/patterns/

• Attachment
  Not set scroll fixed local initial inherit
• Position
  Not set left top left center left bottom right top right center right bottom center top center center center bottom
• Repeat
  Not set repeat repeat-x repeat-y no-repeat initial inherit

Those Images in folder YOURTHEME/img/patterns/

• Attachment
  Not set scroll fixed local initial inherit
• Position
  Not set left top left center left bottom right top right center right bottom center top center center center bottom
• Repeat
  Not set repeat repeat-x repeat-y no-repeat initial inherit