I get asked stuff like this all the time soooooo aside from lululemon TEEKI (amazon, Teeki) and ONZIE (amazon, Onzie) have really cute, fun prints. Black Milk, also. I just dont personally know of any yogis that use Black Milk leggings for yoga. (I do know a powerlifter that has the muscle leggings from Black Milk and she squats in those all the time!). I know people who actually wear Onzie leggings in yoga. And I’ve seen the Teeki Northern Light pants on a lot of tumblrs. Generally, the more print on the legging, the less you have to worry about your goodies showing during down dog (Again, GENERALLY).
And because they’re everywhere, here’s a link specifically to the Northern Lights by Teeki.