Somebody else on this board likes magic, heh.
Check this out, some of the same pictures, but uber high res:
http://www.5colorcontrol.com/images/fanart/Rise_Art/index.html
Also worth noting is my favorite magic artist, Mark Tedin:
http://marktedin.com/home.html
I find some of his concept art very "Quakey" - large scale, polygonal, cyclopean, with good textural detail.