I think there is a lot to be said for getting right to the point. Why say something in 10 words when just a few will do? And if they don't like it, well, that's their look-out; you did use some jolly paper - what more could you do?
Sentiment taken from Birthday Sentiments 1. And only £1.50 with plenty of others that you can use to insult the remainder of your friends and family!