Not bad. It's very basic, and so it's probably useful for a lot of maps.. I don't find it interesting enough myself, since it's only blue - no landscape at all. But then, the map it's intended for can provide this. I'd still like to see maybe some ships or something.
Since you're apparently taking requests, I have one: I will be developing a grungy city map, and I want a skybox similar to the london one - dark, cloudy blue sky with some yellow in it, and dark-lit buildings. The thing is, I don't want normal rectangular buildings. I'd like sci-fi or strange ones in it. The map's going to involve some architecture similar to core_transfer or core_ravage, for example.
I can show you some of the stuff so you have an idea. Maybe you're up for the challenge? :P
8/10 for this skybox, if it's used in the right map. It might work well in Shipwreck, for example..
