By Paulo Ricardo S. Ribeiro (Ricardo 3D).
Alexander Weide shares this image, which includes the full .blend file.
A picture of a 19th-century Blender prototype has been dug up by Stanislav Šestić.
Riofranco shares this awesome Yafaray render (high resolution version here). A tutorial is in progress.
A wonderful set of images by pokestuff. Check out the full series on BlenderArtists.