Nicole- She sounds very dated now.
Nicolette- I think this is a good choice, my only hesitation is that is sounds like Nicorette.
Veronica- Veronica sounds slightly dated, but that gives her charm. Ready for revival.
Monica- Another dated one, but less so if you call her Nico.
Nicola- A fresh way to honor a Nicole.
Nicolina- A fanciful elaboration.
Nicoline- I would go with Nicolina
Danica- She has two great namesakes, Danica Patrick and Danica McKellar.
Nika- Sweet and spunky. She doesn't need a nickname.
Nikita- She comes with bonus nickname Kiki.
Nikolia- This Greek name would be a great choice for families looking to honor a Nicole as well as their heritage.