A few mosaics I've come across recently:
Bruce found this lovely painting, called "Plum blossom in early spring", by Rack Haung (rack911).
Rack also has this cute little snake in honor of the Year of the Snake:
Paul Toxopeus made portraits of the new king and queen of the Netherlands, King Willem Alexander and queen Maxima.
And Arthur Gugick (torgugick) made a decorated tile mosaic of John Lennon, which contains about 4000 tiles:
Arthur also posted this LEGO version of The Scream back in January, which I somehow managed to forget to post at the time: