I stole some of the textures from google (modified heavily), and the fonts were found from the 'net as well.
This was my first attempt, and one of my least favorites. I made a logo for a friend in '99 that used a similar concept. I wanted a stone-like logo, but the texture I used ended up being too cartoonish for my taste--the consequence from when I added color filters to try and make the logo blend better into the stone.
This is the coolest one of them all, but it looked too future-istic for the game. I don't remember how I pulled off the (IMO) very realistic metalic look. I was playing around with lighting and curves in photoshop and it just sorta happened.
This is my second fave. I got a lot of the effects by simply limiting the color palette.
This one is my least favorite... mostly due to the font. But I post it anyway because the glow effect looks grainy and different than most glows that I do. Glow effects are usually considered amateuer, which I suppose I am :P