how do you make sky boxes

i want a night seen but unity dosen't have one, so how would i make one or is there some where that i could get one?

http://www.google.com/search?client=opera&rls=en&q=custom+skyboxes+unity3d&sourceid=opera&ie=utf-8&oe=utf-8&channel=suggest

Google searches can help you with most questions.

http://unity3d.com/support/documentation/Components/class-Skybox.html

API helps too.

Laterrrr!