Adding a Sky?

For my next project, im trying to make an area outside and I want to put up a sky, and the sky textures are side textures, and there are no ceiling textures that look like the sky, so how am i supposed to put one in, thanks to anyone who can help

*using doom builder*

use the F_SKY1 flat as your ceiling.

hehe, wow i never would have thought that was a sky, thanks! :)

heh no problem it took me a bit too :P