There was several way to simulate 2d "non-realistic" clouds to use as background, You can:
a. map some digitized pictures on a plane or a semisphere
(or use a so called scenery generator and/or a mandelbrot
generator utility like FractInt);
b. use a mix of textures like filter noize and color noize
(i.e filnoiz2, colrnoiz2, Imagine v2.9+) on two planes,
the nearest to camera with white shades, the second with
gray ones (isnt it overcast?).
How about realistic 3d clouds? I can advise You to map (with flat color map and
flat filter map) or to use textures (the ones above) on many planes or shapes
one behind the other, it can be a little tip.
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