There are several other types of tattoos out there, although the above are the most common.
Celtic tattoos are also popular as well. They are mostly seen with those who have a Celtic heritage, although some with no Celtic heritage have them as well. They offer a variety of symbols and designs, providing universal meanings for everyone. Often times they are mixed with tribal tattoos to create a more innovative tattoo. The meanings of Celtic symbols can be found at target tattoo and also some various discussions on thetattooforum.com.