Dear Ploni,
Thank you so much for the beautiful (generous) and thoughtful whatever-it-is that you gave me on the occasion of whatever.(If a gifty-gift) I am sure it will grace my table (house) for many years to come, and I will always think of you when I use it. (If a cash gift – I am saving for a new couch, sefer, computer, etc. and your gift will enable me to reach my goal that much sooner.)
Most especially, I want to thank you for sharing in our simcha. B”EH, we should be zochim to be m’shaleim lachem k’gmulchem hatov.