Not only base maps, but base maps with the same id textures. Seems to be common these days which is weird. I never much liked the idbase maps to begin with.
Why doesn't someone at least use the mkoxide modified quake2 textures that I used in Guncotton?
http://www.electricescape.com/etherealhell/mylevels/guncotton/index.php
They were great. Or do a mix of some different sets, rubicon, ikbase, evils' sets, some of lunaran's packs, look at his q4power that's fkn awesome!
http://www.lunaran.com/page.php?id=8
I'd definitely use that if I was starting a new map, you could mix that and rorshach's hh3 clockwork:
http://scmapdb.com/wad:hh3-clockwork
That would be completely unique in Quake, all industrial/dystopian/steampunk.
Actually the last map I started before I retired was going to be really alien, lots of curviness, a bit like an Unreal level, using these:
http://scmapdb.com/wad:dethtex-spacemadness
12 years later and no ones used them yet :(