Are there any mods that add more ruins or expand existing ones? I love exploring the old dwarven ruins.

There's one mod that's ostensibly a house plugin, but I find it very unappealing as a home and great as a dungeon crawl, esp. with its mini questline.

http://skyrim.nexusmods.com/mods/9541

There we go.

http://skyrim.nexusmods.com/mods/15856
Shameless self promotion.

Be sure to check out http://skyrim.nexusmods.com/mods/17011 if you'd like more variety in the ruins. They're incredibly well designed.

Cool, thanks.

Argh. Can't I go through even one character with a stable mod list from beginning to end? Those all looked like great suggestions, dammit.