right, heres my two cents, sorry these are so late but I've been really busy with that inconvenience known as "work", curse them getting in the way of my time here, anyway, here we go and don't worry I can resize these to any dimensions at all:
I really like what I did with the X with the one above, I shaped it and added rivets to make it look like the x-metal nosebridge, just a subtle nod to the x-metal design ethos
I know you asked it to be in caps, but I found the lowercase ".com" works really well with this one, but I can change that in a minute if you really want it all in caps
the one above and the one below are inspired by the stuff others did but with just a few little twists, the one below incorporates "O" with "X" with different colours to emphasise the X with metal accents for the rest of the "chain" (cos I like the design of the rx chain so I thought I'd put a reference to it in this)
...and the one above is like a stamped sheet metal effect
oh and as an added little treat...
http://www.geocities.com/weaponlord/customxmetal.swf :-)
(and I can even make screensaver or an animated gif out of it if you like so you could advertise it as a downloadable wallpaper for mobile phones or whatever, come to think of it I could do that with any of the graphics I've made here).
Fair play to everyone, everyones come up with visual ideas I really like, I guess its a testament to everyone on here how much all of us like to contribute to help, thats what makes this forum so cool