Lots and lots of random Dunmer and Morrowind themed mods! Nothing clashes or runs bad on my copy of Skyrim, and everything slots into the world. No changes to gameplay or major locations on mainland Skyrim. It'll require the Anniversary Edition :D
Basically, this mod adds a series of Things that really add to the experience of playing as a Dunmer. It's lore-friendly stuff that fits in with the tone of both Skyrim and earlier titles in the Elder Scrolls series (a.k.a Morrowind). Most of the mods are outfits or weapons, but there's also a neat dungeon mod and some integration of the really cool Ghosts of the Tribunal DLC. There's a lot of katanas, weird bonemould armour and funky hats. This fits my spellblade playthrough very well, but don't worry if you're a two-hander plate-clad fool or a slimy, stinky rogue who loves bows and daggers - the collection covers all that too!