Perhaps the easiest and most satisfying folding is that of the leggings. Folded exactly the way you would a pair of jeans or trousers, leggings don't typically give you any issues. In fact, they're easier to fold than their denim counterparts. Another point for leggings in the "leggings vs. pants" debate.
Think of it like this: half, half, and thirds. Fold your leggings in half lengthwise so they become one single pant leg. Fold the ankle of the legging up toward the waistband, thus folding it in half from bottom to top. from there, fold your leggings into thirds so they can stand up on their own, file cabinet-style.