The Sky in Blood Gulch...

[~WD~ church]

How can I change it from the normal sky to this...

[CtrlAltDestroy]

Inject it over:

sky\ring\ring clear afternoon
sky\planets\threshold clear afternoon
sky\planets\basis clear afternoon
sky\clear afternoon\bitmaps\stars
sky\clear afternoon\bitmaps\sky clear blue
sky\clear afternoon\bitmaps\clouds puffy light
sky\clear afternoon\bitmaps\cloud mask

Or swap all of them for:
sky\clear afternoon\bitmaps\stars