I've featured Mike Napolitan's work here several times in the past. Some of his pieces are currently on display as part of the Designing Outside the Lines exhibit at the 1 AM art gallery in San Francisco. The show features several LEGO artists, so if you're in the area you should check it out.
Just a quick follow-up to the earlier post. You can find more of Leon Keer's anamorphic art (including several LEGO-themed creations) on his site Streetpainting 3D. He also has a link to this great time-lapse video of the DC heroes piece. You can see how long it took by the movement of the shadows.
I feel bad - I got busy with other things and completely missed making a posting for the 75th anniversary of the release of Action Comics #1 (here by ctellis156) a couple of days ago. Happy birthday, Kal El! You look pretty amazing for a 75-year-old.
Kristi McWii has developed Lil'Figs, a sort of half-scale cube dudes, and here is her Batman. She's posted this as a Cuusoo project, and also made Wonder Woman and War Machine.
Evan Bacon has done it again, this time with a six foot six inch Superman. He plans on bringing this to Brick Fiesta this summer, so you may get a chance to see this in person.