Here are skies for your visualization. The images of heavens can be used directly with all standard programs, such as MentalRay, Brazil, VRay, AutoCad, Photoshop, Cinema 4D (C4D), 3D Studio Max (3DS), Maya, Lightwave, Softimage, Modo, Hudini, Form Z, Piranesi, SketchUP, Rhino, Allplan, VectorWorks, MicroStation, ArchiCAD, Revit, AfterEffects, etc...