But things changed over time. I haven't played D&D with the guys in that campaign in over ten years, and my drow reading list has expanded to include the War of the Spider Queen series, the Starlight and Shadows series, as well as 3rd and 4th edition sourcebooks on the drow and a handful of third party supplements. My favorite drow from Forgotten Realms fiction is now Pharaun rather than Drizzt. I still think it's a shame he died at the end of the War of the Spider Queen series. Needless to say, my horizons are much broader than that initial drow-focused campaign. I think I can do a much better job of it.
In any case, I would love to revisit the Underdark setting, not as an occasional visit in a typical campaign, but as the primary setting for the campaign itself. In the same spirit as (and perhaps drawing material directly from) the Night Below campaign setting, characters would need to find allies in the Underdark rather than just seeing everything that isn't a dwarf as an enemy.
My players already know that many of the Underdark races are my favorites, so seeing a steady supply of opponents such as these wouldn't be entirely out of the ordinary. However, there are many Underdark races that I have used very sparingly and that I would like to give a shot. Mind flayers, beholders, derro, and aboleth immediately jump to mind.
As far as sandbox settings go (I feel like I need to explain because I'm not sure my players are familiar with the term), this would not be a story-driven game. Rather, the game would begin with some sort of story hook to explain why they're together as a team, but thereafter the players themselves would be the movers and shakers of the campaign. The DM creates the setting but doesn't have a particular story line to follow, allowing the players to explore Morrowind/Oblivion/Skyrim-style and building the story as they go based on player actions.
Guys, what do you think?
Note: I'm sending this link to my players in order to get some feedback.