Thank you notes don't have to follow any specific formula, but sometimes it helps to have an idea as to what to do and how to phrase something. Start out by thanking the giver for the gift specifically. "Dear Mary, Thank you so much for the lovely wine glasses." Then insert a line or two about what you like about it or how you plan to use it. "I love the unique design of the glasses. Mark and I can't wait to use them at our next dinner party." Wrap up the note by thanking the giver again for the gift and their general thoughtfulness. "Thank you again for such a thoughtful gift."
As you can see, you can keep it short and simple and still convey your genuine thanks.