Saw an image of the Portuguese Cistern in Morocco, and I started thinking about how I would make a similar ceiling in Blender. This is the result.
I didn't bother with making any materials, so it's just using the default white-foam-looking stuff, but it still looks pretty alright thanks to the background light. Funny thing about CGI--if you make a background right, you can use it to light a scene with incredible detail and minimal effort. This one is from a rather popular source of free 3D backgrounds called HDRI Haven, and it includes the sky, the tree, and the mountains.
I can't tell you the exact specs of this render, alas, because I didn't keep any notes when I rendered it a month or two ago. Said specs likely mean nothing to you all, though, so I'm none too concerned.
