Oi, nice work. I especially like the third one from the top. Though upon looking at the full version, I think you need to add a few more shades to the metallic contraption there.
Use high pass with some scalable threshold set down to layer overlay (pshop lingo).
One more thing. I didn't realize it before, but I finally placed it. Do you remember LUMS Olympiad? I think you were at the photoessay competition and had a story which depicted a lad getting turned down from this girl, who gets depressed and starts to take drugs.
Well guess what? The booth right next to you. I was there. I had some bluish pictures named 'The Stages of Paranoia'. Btw, that time I didn't use anything other than my Canon to publish those pics.