What's a fun thing to do/give for your Best friend on your Friendaversery?

So I've been best friends with my best friend for about 1 year and our 'friendaversery's' coming up and I don't know what to do. Something fun and creative. Nothing that I would have to make like jewelry or something. I was thinking of making a sweatshirt that said 'Marie's best friend'? Oh and we're both 13, so suggestions that would be suitable for our age? Thanks :)