Background Image
Design and Skin Customization
If you are using a small image, it may not look very well if it is resized to a larger size. If it were me, I would make the background image as large as you need/want it. You can also change the repeat to no-repeat in the CSS file were the background image is being called.
For example, if your using the Ningja skin, in your skins/jrNingja/css/site.css, change this:
margin:0 auto;
background-color:
background-image: url('{$jrNingja_img_url}/wrapper_bckgrnd.png');
background-attachment: fixed;
background-position: left top;
background-size: initial;
background-repeat: repeat-x;}
to this:
margin:0 auto;
background-color:
background-image: url('{$jrNingja_img_url}/wrapper_bckgrnd.png');
background-attachment: fixed;
background-position: left top;
background-size: initial;
background-repeat: no-repeat;}
You may also want to change the background-size element to cover instead of initial.