I personally bought a pair of "Natural" circle lenses. They enhance what I already have without adding color, only a ring. The ones I have are the smallest of these huge lenses available and still looks quite interesting. But some of the bigger ones can get to look quite buggy and creepy. Of course they originated in Asia with their childlike idealization of beauty and anime influences. Just thought it might be an interesting topic.
Heres a pic of me with my circle lenses:

Theyre used to achieve the "Ulzzang" or "Perfect Face" look, heres me trying out the look:

PS>My eyes are naturally a light brown but my Sidekick makes everything have a green tint and is overexposed