[Freesteyelz]

Most lay the overall background in Admin CP --> Styles & Templates --> Style Manager --> Main CSS and in the first text-box area in "Body" add CSS attributes for "background":

#000000 url(path/to/background/image.gif/jpg) repeat-x top left

1) #000000 = overall background color (shown is black)
2) gif/jpg = whichever extension you're using
3) repeat-x = the image will repeat horizontally (repeat-y = vertical; repeat = both horizontal and vertical; no-repeat = image will be static)
4) top = image will start from the top of page (keep this at top)
5) left = image will start left of page (or right and center)

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To change the width of from a percentage to static go to Admin CP --> Styles & Templates --> Style Manager --> StyleVars and change the "Main Table Width (pixels or percentage)" to a different number.

Percentage = 100% (make sure to add the percentage after number)
Pixel (or fixed width) = just add the number but do not add the "px" after it)

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For more information for vB template stuff go to vBulletin Manual and in the left column search box type "Color Map Reference".

Hope this helps.