PLEASE ANSWER...I really need some ideas for my friend's birthday?

Well my best friend and I has known each other since the sixth grade and now this upcoming fall we are gonna be seniors in high school.She is like the coolest person ever,I love her so much and I feel very lucky to have a friend like her.BUT...Her birthday is coming up in abut a week and I really am out of ideas of what to get her.So can anyone please just give me some ideas,it can be anything.I plan on spending up to $50 if I have too....