Hand painted skybox

Some info about using Terragen & Skypaint
https://developer.valvesoftware.com/wiki/Skybox_(2D)_with_Terragen_and_Skypaint_-_Advanced
Hand pained skybox
http://www.polycount.com/forum/archive/index.php/t-85151.html

I ended up painting the skybox by hand in photoshop, using an existing unity skybox (sunny) as template for the cloud shapes, to avoid the pinching & stretching effect that happened after using one painted from scratch

The skybox still had some ugly seams though, that broke the illusion.
http://forums.epicgames.com/threads/446850-Ahh!-Texture-seams-in-my-skybox!
Setting it to CLAMP didn't work
http://answers.unity3d.com/questions/9850/custom-skybox-seams.html
http://answers.unity3d.com/questions/167293/texture-compression-skybox-seams.html
Next step is playing around with the compression I guess...