A 768×768 JPEG image of a cloudy sky created by ppmforge.  Is your Web
document a breath of fresh air?  If so, here's a nice background to
set it off.  Make sure your text colours contain a substantial red
component to guarantee high contrast against the gradations of blue
and white in this image.

For information on ppmforge, visit:

    http://www.fourmilab.ch/terranova/source/ppmforge.doc

Ppmforge is part of the standard NETPBM raster toolkit distribution.
Use:

    archie netpbm

to find the closest source for this package.

This image is in the public domain.