Considering half of what I wear normally is workout clothes, I like to think of myself as fairly well versed in cute athletic wear. One of my favorite trends that I've recently gotten really into is mesh leggings. I have two pair of Lululemon leggings with criss-cross mesh designs on them and they're the best. I always get compliments on them, and they're surprisingly comfortable.
Lulu is my usual go-to for mesh leggings, but I found some great options from Bandier, Lorna Jane, and Athleta. The great thing about these leggings is that I really wear them more casually rather than to work out...literally the definition of athleisure (lol).