Dear …
Thank you for sharing in the celebration of my __(#)__ Birthday! And thanks for the __(type of gift)__. It’s just perfect and I know it will be put to good use!
A Birthday party just seems to shine so much brighter when surrounded by great friends. I am so delighted that you came and hope you enjoyed yourself as much as I did having you there. Thank you for making my special day extra special by being part of it, __(Name)__.
Your friendship has become a part of my life in so many ways. A reassuring shoulder to lean on through tough times and one who shares my joy and laughter throughout the good times. How wonderful it is to call you my friend. Thanks again, __(Name)__, for celebrating my __(#)__ birthday with me!
Your friend,