16 well i got a few rude things. which i wont mention on here. you can get a beauty voucher to get her nails done or whatever. clothes voucher. Does she have a favourite magazine subscription to that. is she into anything and how much do you want to spend is the question?
Or all if you are completely stuck perhaps give her money instead? Money is always liked by 16 year old as they can buy whatever they choose etc. Or if you want to go the vouncher like, perhaps music vouchers? Or nice jewellery?
I was 16 last year and people got me loads of new look things and funky bracelets etc but I'm sure you cant go wrong with a accezorize/claires accesories voucher everyone loves those shops but i gues it depends what shes like x
I also agree with a bit of money. It's the only thing that is almost always appreciated! I have my 17th on Sunday and I'm very happy with book vouchers and money. That way I can get eactly what I want.