When you have run out of surface area on your skin, look inwards ... at your own eyes.
I guess some body modification nuts thought it was a good idea to have the whites of their eyes stained with blue ink.
They tried the standard tattoo equipment but to no avail. A syringe finally did the trick.
If you're into messing with your eyes, you might also like these:
Implications - These freaky eye color tattoos may not be for everyone, but this kind of body modification appeals to the growing population of consumers who will go to immeasurable lengths to achieve what they perceive as perfection; true individuality. Companies that delve deeper into this consumer mindset will see benefit.