I also like the first one best, but they're all really nice. The sig that you made for a website is...wow. The rounded cube is superb. I love the smooth texture to it. And also, did you do the game textmaps all in PDN or you used some other program?
It says (with a few corrections), "Attention. Don't try to jump on buildings. You will get hurt. Instead of that, try the doors. If you don't understand how this works, you are going to die. Thank you for your understanding."
Hmmm...
Cool work. The grungey work compliments the title of your gallery "...images of doom." Kind of spooky if I may say so. And also, there's a few grammar mistakes in the second image, unless you did that deliberately.