Sky Boxes have been added to Decade, and as a friend has commented they give the scene atmosphere in more than 1 sense. The sky boxes used were taken from Hazel Whorley who offers his creations free for use in non-commercial projects. They are some of the best free sky box textures I have ever seen.
I will use sky boxes for a while with Decade however I want to soon implement sky domes. They have many advantages over sky boxes. Due to the cube nature of the sky box it is very difficult to animate the sky without the cube structure becoming obvious to the user. The dome removes this and will allow me to set the time of day and add procedural clouds.