A futuristic server room from a short film project I'm working on. The model has nearly five million vertices, almost 10 million tris, and 4.5 million faces. It was pretty difficult to light and render it correctly, but it came out nicely.
30,000 samples, 14 hours and 39 minutes to render.
Made in Blender, touched up in photshop, and the smoke was done in After Effects.