Maybe there should be a vote for the next mapjam theme? ikwhite seems to have put some people off and a low grav theme I'm none too excited about particularly if it's in the void (coagula). Nor Rubicon since we already have that Rubicon pack.
What about a Doom4 theme - the way D4 should be done. With a mix of a doom2 and doom3 set, obviously hand picked. I'm never a fan of q1 base maps, but if done more like alien sci-fi/industrial then it's okay. It's just quakes interpretation of military bases that was the weakest link in quake, imo, yet probably the most overdone theme since. But yeah the d3 texture set had a limited success rate, some of them looked pretty bad, some were okay. Maybe it could actually mix some different stuff like some of the sci-fi textures from these sets:
https://www.quaddicted.com/files/wads/charon_liquidc1_q1.zip_chrn_lc1.wad.jpg
https://www.quaddicted.com/files/wads/charon_liquidcarbon.zip_charon_liquidcarbon.wad.jpg
Or Dtspacemad... that was the last set I was using to make something (was going to be an alien spaceship), but never finished it.
I just searched for 'video game textures' in goog, because I've got no idea where you get textures these days, but that put on this page:
http://www.pinterest.com/GameTextures/video-game-textures/
Now wtf, there's some awesome fucking textures on that page. Some might not tile, and they'll all need converted down to quake. I notice a lot are kind of hand-painted, maybe there could be a cartoony texture theme, kind of like Borderlands.
Some of those textures remind me of alice... another good underused set.
How about gentex02. That's an awesome texture set that's underused.
Or an industrial mix of ogro/jackboot. Think a modern zerstorer (but not literally zers textures!).
Evil has some great textures in it, but it would take someone sifting through 1000 of them picking out a consistent theme.
Rorshach did many awesome textures. In fact here's a whitish texture set that works, though it's clearly not the same architectural style of ikwhite:
http://www.kevinjohnstone.com/Polycount/textures/singlemalt.htm
In fact, some of you guys should look through rorshach's textures, they're all a similar style but all frickin awesome.
http://www.kevinjohnstone.com/Polycount/index2.shtml
Schloss or a ww2/nazi/wolfenstein theme (maybe wolf textures? I haven't seen those out there though, at least not that I can remember.
I don't know what I did with the fakk2 textures, or who converted them (maybe it was me when I knew how), but those textures were good and no ones used them since I did in
http://www.electricescape.com/etherealhell/index.php/my-levels/item/carved-in-flesh
Someone might have to re-install fakk2 to get them though.
Unreal skycity? There's lots of medieval type sets out there that have been used sometimes... dkt, heretic, hexen, q3, kingpin, rune, undying, blood, praeven, but I'm sort of thinking along the lines of stuff that really is underused (or never used).
But anyway those are just my thoughts...