The best way to make it unique is to tailor it to the person you're writing it for. Think of experiences you've shared with them and reflect back on those. Talk about the good times you've had together and the good times you're looking forward to in the future.
Congratulations! You've earned an A for your birthday!
You're now in the 90th percentile! Of life, and everything else.
Ten more years, then you're 100% of the way!