skybox help!

Hi,
ok im making a night map and i need to know if theres a place i can get a night skybox texture. Or I need to know how to make my own skybox texture.
If you can help that would be great.

http://www.facepunch.com/showthread.php?t=954393

Try that?

hey thx just one more question. where do i put all the skybox stuff i get in the download?

steam\steamapps\username\game\game\materials\skybox

how do i put it in source sdk?