Cloud Rendering

Hi,
I'm trying to do some fairly realistic-looking cloud-rendering, in a 3D game.

These are the main requirements...


1)        Have a high-cloud layer that can range from 0 to full coverage

2)        Have lower clouds (sprites) that fade&roll in and out and move around and are "lit by the Sun", so the light can catch edges, and cause the other side to appear in shadow etc.

3)        Have colours of the sky change, as the sun rises/sets etc

Can anyone suggest any ideas/tips/tricks or links to help me in my quest?

Your input would be very much appreciated.

Cheers
Zaf
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