If there is a trend that has taken off in the last five years in body modification, the watercolor tattoo would be it. This is a style of tattooing named after its mimicry of the freeform and diaphanous quality of the actual painting method. Watercolor tattoos thus stand out against most other tattoo styles, which tend to boast strong, dark lines.
Attractive as they are, though, they have also received some criticism: some claim they cannot hold up as well as other tattoos over time, others that the term is far too often used by tattooists inexperienced in the style. Whatever the case, you should learn more about watercolor tattooing before you make up your own mind about getting or not getting one.