I purchased small bottles of hand washing soap at Target for a dollar to make this project. For the "thank you" sign I used the website What a Lovely Name. This website has the option to type in your own names if they are not on the list. The label for this soap bottle is 2.5" high and 5.5" wide. I left the sides white so that the "thank you" would be square.
You can easily adjust this to any sized bottle. Just measure the circumference with a soft measuring tape and add 1/2 and inch. Then measure the height by measuring the size of the front label that you want to hide.