background-repeat: no-repeat;

2.

background-repeat: repeat-y;background-position: center center; = repetición vertical.
     2a.

       background-repeat: repeat-y;
       background-position: 30px;
    2b.

       background-position: left, right;
       background-repeat: repeat-y, repeat-y;
3.

    background-repeat: repeat-x; = repetición horizontal de la parte inferior.
    3a.

    background-repeat: repeat-x;
    background-position: 30px;
4.

background-repeat: repeat; = repetición en todos los sentidos de los antecedentes.
5. 

background: url(images/image_name.jpg);
    no-repeat center center fixed;
7.

background-image: url(circle.png);
     background-repeat: repeat;
     background-position: 50% 50%;
8. background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
9. background-image:url(http://blog-3.jpg);
    background-position: center;
    background-repeat:no-repeat;
   background-attachment: fixed;
10.

background-image:url(http://jpg );
       background-repeat:repeat;
       background-position:top center;
       overflow-x:hidden;