This is a scaled down pic of my desktop background I made in Bryce4 a while back (using a pokey 800MHz computer.) In my case the texture source images were only 2000x1000px. Never could get the transparencies to work right on the cloud layer source map. I think it looks decent enough for a desktop image though.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.