Hi M.,
There is a book titled How to Say It, which has helped me with thank you notes & many other tasks. I highly recommend it. There are several pages of tips, words and phrases. Some of the words are: admire, affection, appreciate, charming, delighted, enchanted, enjoyed, flattered, generous, gracious, grateful, happy, kindness, lovely, one-of-a-kind, overjoyed, perfect, pleased, special, terrific, thoughtful, thrilled, treasure and valuable. Maybe some of these will help spark some ideas.
Here are some phrases:
pleased as punch
quite out of the ordinary
you knew just what we needed
show my appreciation
tickled our fancy
useful/appropriate/attractive/delightful gift
we were simply thrilled/delighted/stunned with
wonderful surprise
what a joy it was to receive
your kindness/generosity
it was a great pleasure
Your gift was right on target.
These are just a few of many suggested phrases.It also suggests mentioning in some detail what you are grateful for. Perhaps you really like a color or the lace or embroidery. Tell how you will use it. "This will make bathtime fun/so much easier."
End by expressing affection, sending greetings to family members, or saying something nice about the donor. "How lucky I am to have a thoughtful friend as you." "You are so kind."
Hope this helps!
S.