I've always been inspired by the high-quality artwork of the 40K universe to convert and kitbash my models, such as the above image (Grey Knight dreadnought unit entry in the Codex: grey Knights). One day I was rooting around my collection and found this hidden gem:
Part 2 of the heretical concept art theme that is "Hey Kids, lets Play 40k!", this time with extra-Chaos flavour as a treat for all you enthusiasts of the Ruinuous Powers. As before, click to embiggen!
Also click on my deviantart profile for the original-sized version of the artwork (re-sized so you can read the enclosed internal memos) and also for more information, if you're curious as to how the idea came about especially on the subconscious thought processes involved.
Disclaimer: All graphic likenesses and copyrights held by original owners, used flagrantly without permission for the sake of satirical parody, no intent to profit from the use/abuse of such copyright, etc, etc.