You can try french shine series! Since you wear brown til now (natural line) french shine won't be too much for the first time!! My favorite is hazel but if you are sick of brown :D try lavender!

Highly recommend Smoky !! That's my favorite. The color is bright, looking so good on dark brown eyes!

Perhaps you can give grey or green lenses a try! Vivi Ring or Spanish collection lenses are a good start. If you are feeling a bit more adventurous you can go for pink lenses (E.g Vivi Ring pink)

if you wanna start small, i would recommend vivi ring gray or beige :) secriss natural series is a great choice too!

I think greys and greens are good new colors to try!

You can try Smoky or Velvet?? Personally I like Smoky Gray!! It is really gorgeous and the color change shows up really well~~