OnlyLeggings.com (image above is from their site) has a bunch of leggings in all different patterns and textures.
How cute are these Fair Isle Leggings from j.crew?
We've already been over my love for these Lands' End leggings, but they're worth mentioning again!
Then there are these Nordic leggings found via yesstyle.com
Here's another pair from yesstyle.com
These are from foottraffic.com
These Fair Isle Knit Tights are from Forever 21.
Fair Isle Knit Socks from Madewell