We also have two main group projects with teams of 15-16 people, at least for my class. The numbers vary from class to class, but my teams have had 4 level designers and the rest split between artists and programmers. I think the LDs usually outnumber the other disciplines, but my class is is quite short on them.
My current group project is
Dissonance, a single-player, Half-Life 2: Episode 2 full conversion. It is an RTS/rhythm game hybrid. The concept is warring musical factions, one side representing Metal, the other, Techno. You control an avatar which can summon and command four unique unit types and wields abilities that can attack directly or buff/debuff units. It's a bit hard to envision, but the control concept is similar to Overlord, only you have resource points to control and a similar opponent and units to defeat. The catch is that you use rhythm-game based controls to summon units and activate abilities. It also features a dynamic music system where numerous tracks from both factions are interwoven depending on what's happening in-game.
I'm the producer on this project, so I'm mostly involved with scheduling tasks and coordinating leads. I don't really get to touch the design/level design directly which can be frustrating at times, but it's interesting to have the experience from both sides. I'll probably post the mod once it's finished. I won't post the design docs since I wasn't directly involved in them, but I might post the Asset and Dev plan eventually, though I don't think anyone would enjoy looking at it very much hehe.
I'll post one shot of this in case it helps the concept to make sense, but it's a bit early still, so this isn't exactly representative of what the final product will look like.
Our other team project was
Extinction, a multiplayer, team and class based, caveman v. dinosaur game. I posted a breif description of the rules and screenshots in
this thread, so I'll only post the level overview shot here. I was game designer and lead level designer on this one. I would post the mod, but it's since it's over a gig and you really need 10+ people to make it fun, I don't think it would get much usage. Here are the docs though:
Extinction: Game Design Doc Extinction: Level Design Doc