I had it like that origanally, but it does'nt really look that great, it has no radiance at the horizon. In real life, at the horizon, it will be more white-like and it will gradualy change to blue as you point up.

When a texture is used for a sky, at the sky_clip and below, it blends to the fog color or SKY_COLOR, so if my bitmap is blue and my fog color is white, it looks realistic. That beind said, if it's gonna look good, i'm gonna need the sky dome to work.