What to get a British cousin for her 16th birthday?

I'm going on a vacation with my Brit cousins in a week or so...while we'll be there, one of them is having her birthday. She's 16, and I know she's interested in music and art. I haven't spoken to her in about two years, as we were never very close and I live in the US and she lives in the UK. What can I get her that isn't too expensive, something I can get fairly quickly, and that she'll love? Maybe something you can't get in the UK?