Ohh nice find. Like the bladerunner entries!
Hey guys. Thought I'd drop this link. Theres a group of artists over at conceptart.org that pump out environment maps like 5 times a month or so. Great for inspiring maps. It takes a little digging but I've found tons of inspiration.
Give it a whirl.
Ugh... what a horrible idea... putting captcha validation in a search window.
Can you provide any direct links, because when I try searching I'm not getting any apparently useful results.