Attached Link: http://rcpt.yousendit.com/813988994/e09bd2edf50ef769cb458a4d3f55bdc5

Here's a rainbow sky with a spectral cloud (sorry for the grain in the clouds, it was just a quick render). This was made in Vue6, my Vue8 is now rendering.

Above you can find the link to download the Vue scene, in case you find it useful.

Have fun! :-)