Thumb tattoos have become very popular in the past few years, especially for women who are looking for something unique and daring. A thumb tattoo is a unique type of body art that is usually placed on the thumb or the index finger. It is usually a very small and subtle tattoo that is usually a symbol or design that is meaningful to the person who has it. Thumb tattoos are usually very personal and can represent a special memory or something that the person wants to remember.